diff --git a/Cargo.lock b/Cargo.lock
index 7fe06ab01b..9624ea88af 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -69,7 +69,7 @@ version = "0.3.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace-sys 0.1.32 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc-demangle 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -131,11 +131,6 @@ dependencies = [
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "bytes"
-version = "0.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "c2-chacha"
 version = "0.2.3"
@@ -151,7 +146,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cfg-if"
-version = "0.1.9"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -212,7 +207,7 @@ name = "crc32fast"
 version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -230,7 +225,7 @@ version = "0.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "crossbeam-utils 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memoffset 0.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -250,7 +245,7 @@ name = "crossbeam-utils"
 version = "0.6.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -260,7 +255,7 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "autocfg 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -282,7 +277,7 @@ dependencies = [
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_json 1.0.41 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 1.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -347,7 +342,7 @@ name = "dirs"
 version = "2.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "dirs-sys 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -356,7 +351,7 @@ name = "dirs-sys"
 version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_users 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -382,7 +377,7 @@ name = "encoding_rs"
 version = "0.8.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -419,7 +414,7 @@ name = "flate2"
 version = "1.0.12"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz_oxide 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -562,7 +557,7 @@ name = "getrandom"
 version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasi 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -760,7 +755,7 @@ name = "log"
 version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -810,10 +805,9 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "0.6.20"
+version = "0.6.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -832,7 +826,7 @@ version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -844,7 +838,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -872,7 +866,7 @@ name = "net2"
 version = "0.2.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -884,7 +878,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "cc 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)",
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -931,7 +925,7 @@ name = "parking_lot_core"
 version = "0.6.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -950,11 +944,6 @@ name = "percent-encoding"
 version = "2.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "pin-project-lite"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "pin-utils"
 version = "0.1.0-alpha.4"
@@ -1409,7 +1398,7 @@ name = "socket2"
 version = "0.3.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1482,7 +1471,7 @@ name = "tempfile"
 version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1531,7 +1520,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-current-thread 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1547,28 +1536,6 @@ dependencies = [
  "tokio-uds 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "tokio"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "bytes 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-core 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio-named-pipes 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "pin-project-lite 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "signal-hook-registry 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-macros 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "tokio-buf"
 version = "0.1.1"
@@ -1627,15 +1594,6 @@ dependencies = [
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "tokio-macros"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "quote 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "tokio-process"
 version = "0.2.4"
@@ -1646,7 +1604,7 @@ dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-named-pipes 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1663,7 +1621,7 @@ dependencies = [
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1692,7 +1650,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "signal-hook 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1718,7 +1676,7 @@ dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1758,7 +1716,7 @@ dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1774,7 +1732,7 @@ dependencies = [
  "iovec 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.65 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)",
+ "mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1791,7 +1749,7 @@ name = "try_from"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1921,7 +1879,7 @@ name = "wasm-bindgen"
 version = "0.2.54"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen-macro 0.2.54 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -2100,10 +2058,9 @@ dependencies = [
 "checksum bumpalo 2.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ad807f2fc2bf185eeb98ff3a901bd46dc5ad58163d0fa4577ba0d25674d71708"
 "checksum byteorder 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)" = "a7c3dd8985a7111efc5c80b44e23ecdd8c007de8ade3b96595387e812b957cf5"
 "checksum bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)" = "206fdffcfa2df7cbe15601ef46c813fce0965eb3286db6b56c583b814b51c81c"
-"checksum bytes 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "549c8cf9befa7948bfd9ebb0ed84c6b25b0400046b6db1b73c026e4117c26c12"
 "checksum c2-chacha 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "214238caa1bf3a496ec3392968969cab8549f96ff30652c9e56885329315f6bb"
 "checksum cc 1.0.47 (registry+https://github.com/rust-lang/crates.io-index)" = "aa87058dce70a3ff5621797f1506cb837edd02ac4c0ae642b4542dce802908b8"
-"checksum cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "b486ce3ccf7ffd79fdeb678eac06a9e6c09fc88d33836340becb8fffe87c5e33"
+"checksum cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
 "checksum clap 2.33.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5067f5bb2d80ef5d68b4c87db81601f0b75bca627bc2ef76b141d7b846a3c6d9"
 "checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
 "checksum constant_time_eq 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "995a44c877f9212528ccc74b21a232f66ad69001e40ede5bcee2ac9ef2657120"
@@ -2169,7 +2126,7 @@ dependencies = [
 "checksum mime 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)" = "dd1d63acd1b78403cc0c325605908475dd9b9a3acbf65ed8bcab97e27014afcf"
 "checksum mime_guess 2.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1a0ed03949aef72dbdf3116a383d7b38b4768e6f960528cd6a6044aa9ed68599"
 "checksum miniz_oxide 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "6f3f74f726ae935c3f514300cc6773a0c9492abc5e972d42ba0c0ebb88757625"
-"checksum mio 0.6.20 (registry+https://github.com/rust-lang/crates.io-index)" = "72f4261ee7ab03cd36dc99eea4db8be6e83e4164da470e0c84f6726d6c605855"
+"checksum mio 0.6.19 (registry+https://github.com/rust-lang/crates.io-index)" = "83f51996a3ed004ef184e16818edc51fadffe8e7ca68be67f9dee67d84d0ff23"
 "checksum mio-named-pipes 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "f5e374eff525ce1c5b7687c4cef63943e7686524a387933ad27ca7ec43779cb3"
 "checksum mio-uds 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)" = "966257a94e196b11bb43aca423754d87429960a768de9414f3691d6957abf125"
 "checksum miow 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8c1f2f3b1cf331de6896aabf6e9d55dca90356cc9960cca7eaaf408a355ae919"
@@ -2183,7 +2140,6 @@ dependencies = [
 "checksum parking_lot_core 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b876b1b9e7ac6e1a74a6da34d25c42e17e8862aa409cbbbdcfc8d86c6f3bc62b"
 "checksum percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
 "checksum percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
-"checksum pin-project-lite 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f0af6cbca0e6e3ce8692ee19fb8d734b641899e07b68eb73e9bbbd32f1703991"
 "checksum pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)" = "5894c618ce612a3fa23881b152b608bafb8c56cfc22f434a3ba3120b40f7b587"
 "checksum ppv-lite86 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "74490b50b9fbe561ac330df47c08f3f33073d2d00c150f719147d7c54522fa1b"
 "checksum proc-macro-hack 0.5.11 (registry+https://github.com/rust-lang/crates.io-index)" = "ecd45702f76d6d3c75a80564378ae228a85f0b59d2f3ed43c91b4a69eb2ebfc5"
@@ -2247,14 +2203,12 @@ dependencies = [
 "checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
 "checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
 "checksum tokio 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)" = "5a09c0b5bb588872ab2f09afa13ee6e9dac11e10a0ec9e8e3ba39a5a5d530af6"
-"checksum tokio 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b5f74af90f3137ddcda0750d904390b289793c40fce7b6e94600b367533205d8"
 "checksum tokio-buf 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "8fb220f46c53859a4b7ec083e41dec9778ff0b1851c0942b211edb89e0ccdc46"
 "checksum tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5c501eceaf96f0e1793cf26beb63da3d11c738c4a943fdf3746d81d64684c39f"
 "checksum tokio-current-thread 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "d16217cad7f1b840c5a97dfb3c43b0c871fef423a6e8d2118c604e843662a443"
 "checksum tokio-executor 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "0f27ee0e6db01c5f0b2973824547ce7e637b2ed79b891a9677b0de9bd532b6ac"
 "checksum tokio-fs 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "3fe6dc22b08d6993916647d108a1a7d15b9cd29c4f4496c62b92c45b5041b7af"
 "checksum tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "5090db468dad16e1a7a54c8c67280c5e4b544f3d3e018f0b913b400261f85926"
-"checksum tokio-macros 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d5795a71419535c6dcecc9b6ca95bdd3c2d6142f7e8343d7beb9923f129aa87e"
 "checksum tokio-process 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)" = "afbd6ef1b8cc2bd2c2b580d882774d443ebb1c6ceefe35ba9ea4ab586c89dbe8"
 "checksum tokio-reactor 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)" = "c56391be9805bc80163151c0b9e5164ee64f4b0200962c346fea12773158f22d"
 "checksum tokio-rustls 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)" = "1df2fa53ac211c136832f530ccb081af9af891af22d685a9493e232c7a359bc2"
diff --git a/core/Cargo.toml b/core/Cargo.toml
index f4f4a0bc3e..cea3992c91 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -28,4 +28,4 @@ path = "examples/http_bench.rs"
 
 # tokio is only used for deno_core_http_bench
 [dev_dependencies]
-tokio = { version = "0.2.0", features = ["full"] }
+tokio = "0.1.18"
diff --git a/core/examples/http_bench.rs b/core/examples/http_bench.rs
index 40083ee4fd..a7b26f4b15 100644
--- a/core/examples/http_bench.rs
+++ b/core/examples/http_bench.rs
@@ -13,23 +13,25 @@ extern crate log;
 extern crate lazy_static;
 
 use deno::*;
-use futures::future::Future;
+use futures::compat::AsyncRead01CompatExt;
+use futures::compat::AsyncWrite01CompatExt;
 use futures::future::FutureExt;
 use futures::future::TryFutureExt;
+use futures::io::{AsyncRead, AsyncWrite};
+use futures::stream::StreamExt;
 use std::env;
+use std::future::Future;
 use std::io::Error;
 use std::io::ErrorKind;
 use std::net::SocketAddr;
 use std::pin::Pin;
 use std::sync::Mutex;
 use std::sync::MutexGuard;
-use tokio::io::AsyncRead;
-use tokio::io::AsyncWrite;
+use std::task::Poll;
+use tokio::net::tcp::Incoming;
 
 static LOGGER: Logger = Logger;
-
 struct Logger;
-
 impl log::Log for Logger {
   fn enabled(&self, metadata: &log::Metadata) -> bool {
     metadata.level() <= log::max_level()
@@ -170,30 +172,27 @@ fn main() {
   isolate.register_op("write", http_op(op_write));
   isolate.register_op("close", http_op(op_close));
 
-  let multi_thread = args.iter().any(|a| a == "--multi-thread");
+  let main_future = isolate
+    .then(|r| {
+      js_check(r);
+      futures::future::ok(())
+    })
+    .boxed();
 
-  let mut builder = tokio::runtime::Builder::new();
-  let builder = if multi_thread {
+  if args.iter().any(|a| a == "--multi-thread") {
     println!("multi-thread");
-    builder.threaded_scheduler()
+    tokio::run(main_future.compat());
   } else {
     println!("single-thread");
-    builder.basic_scheduler()
-  };
-
-  let mut runtime = builder
-    .enable_io()
-    .build()
-    .expect("Unable to create tokio runtime");
-  let result = runtime.block_on(isolate.boxed());
-  js_check(result);
+    tokio::runtime::current_thread::run(main_future.compat());
+  }
 }
 
 pub fn bad_resource() -> Error {
   Error::new(ErrorKind::NotFound, "bad resource id")
 }
 
-struct TcpListener(tokio::net::TcpListener);
+struct TcpListener(Incoming);
 
 impl Resource for TcpListener {}
 
@@ -216,23 +215,27 @@ fn op_accept(
 ) -> Pin<Box<HttpOp>> {
   let rid = record.arg as u32;
   debug!("accept {}", rid);
-
-  let accept_fut = futures::future::poll_fn(move |cx| {
+  let fut = futures::future::poll_fn(move |cx| {
     let mut table = lock_resource_table();
     let listener =
       table.get_mut::<TcpListener>(rid).ok_or_else(bad_resource)?;
-    let listener = &mut listener.0;
-    listener.poll_accept(cx)
-  });
-
-  let fut = async move {
-    let (stream, addr) = accept_fut.await?;
+    let mut listener = futures::compat::Compat01As03::new(&mut listener.0);
+    match listener.poll_next_unpin(cx) {
+      Poll::Ready(Some(Err(e))) => Poll::Ready(Err(e)),
+      Poll::Ready(Some(Ok(stream))) => {
+        let addr = stream.peer_addr().unwrap();
+        Poll::Ready(Ok((stream, addr)))
+      }
+      Poll::Pending => Poll::Pending,
+      _ => unreachable!(),
+    }
+  })
+  .and_then(move |(stream, addr)| {
     debug!("accept success {}", addr);
     let mut table = lock_resource_table();
     let rid = table.add("tcpStream", Box::new(TcpStream(stream)));
-    Ok(rid as i32)
-  };
-
+    futures::future::ok(rid as i32)
+  });
   fut.boxed()
 }
 
@@ -241,15 +244,12 @@ fn op_listen(
   _zero_copy_buf: Option<PinnedBuf>,
 ) -> Pin<Box<HttpOp>> {
   debug!("listen");
-  let fut = async {
-    let addr = "127.0.0.1:4544".parse::<SocketAddr>().unwrap();
-    let listener = tokio::net::TcpListener::bind(&addr).await?;
-    let mut table = lock_resource_table();
-    let rid = table.add("tcpListener", Box::new(TcpListener(listener)));
-    Ok(rid as i32)
-  };
-
-  fut.boxed()
+  let addr = "127.0.0.1:4544".parse::<SocketAddr>().unwrap();
+  let listener = tokio::net::TcpListener::bind(&addr).unwrap();
+  let mut table = lock_resource_table();
+  let rid =
+    table.add("tcpListener", Box::new(TcpListener(listener.incoming())));
+  futures::future::ok(rid as i32).boxed()
 }
 
 fn op_close(
@@ -257,13 +257,11 @@ fn op_close(
   _zero_copy_buf: Option<PinnedBuf>,
 ) -> Pin<Box<HttpOp>> {
   debug!("close");
-  let fut = async move {
-    let rid = record.arg as u32;
-    let mut table = lock_resource_table();
-    match table.close(rid) {
-      Some(_) => Ok(0),
-      None => Err(bad_resource()),
-    }
+  let rid = record.arg as u32;
+  let mut table = lock_resource_table();
+  let fut = match table.close(rid) {
+    Some(_) => futures::future::ok(0),
+    None => futures::future::err(bad_resource()),
   };
   fut.boxed()
 }
@@ -275,20 +273,17 @@ fn op_read(
   let rid = record.arg as u32;
   debug!("read rid={}", rid);
   let mut zero_copy_buf = zero_copy_buf.unwrap();
-
-  let read_fut = futures::future::poll_fn(move |cx| {
+  let fut = futures::future::poll_fn(move |cx| {
     let mut table = lock_resource_table();
     let stream = table.get_mut::<TcpStream>(rid).ok_or_else(bad_resource)?;
-    let pinned_stream = Pin::new(&mut stream.0);
-    pinned_stream.poll_read(cx, &mut zero_copy_buf)
-  });
-
-  let fut = async move {
-    let nread = read_fut.await?;
+    let mut f: Box<dyn AsyncRead + Unpin> =
+      Box::new(AsyncRead01CompatExt::compat(&stream.0));
+    AsyncRead::poll_read(Pin::new(&mut f), cx, &mut zero_copy_buf)
+  })
+  .and_then(move |nread| {
     debug!("read success {}", nread);
-    Ok(nread as i32)
-  };
-
+    futures::future::ok(nread as i32)
+  });
   fut.boxed()
 }
 
@@ -299,20 +294,17 @@ fn op_write(
   let rid = record.arg as u32;
   debug!("write rid={}", rid);
   let zero_copy_buf = zero_copy_buf.unwrap();
-
-  let write_fut = futures::future::poll_fn(move |cx| {
+  let fut = futures::future::poll_fn(move |cx| {
     let mut table = lock_resource_table();
     let stream = table.get_mut::<TcpStream>(rid).ok_or_else(bad_resource)?;
-    let pinned_stream = Pin::new(&mut stream.0);
-    pinned_stream.poll_write(cx, &zero_copy_buf)
-  });
-
-  let fut = async move {
-    let nwritten = write_fut.await?;
+    let mut f: Box<dyn AsyncWrite + Unpin> =
+      Box::new(AsyncWrite01CompatExt::compat(&stream.0));
+    AsyncWrite::poll_write(Pin::new(&mut f), cx, &zero_copy_buf)
+  })
+  .and_then(move |nwritten| {
     debug!("write success {}", nwritten);
-    Ok(nwritten as i32)
-  };
-
+    futures::future::ok(nwritten as i32)
+  });
   fut.boxed()
 }