Try to fix travis

.travis.yml

@@ -14,6 +14,7 @@ env:
 before_install: |
   if [[ $TRAVIS_OS_NAME == 'linux' ]]; then
     # protoc
+    if [ -d $PROTOBUF_ROOT ]; then
       mkdir -p $PROTOBUF_ROOT
       pushd $PROTOBUF_ROOT
       wget https://github.com/google/protobuf/releases/download/v3.1.0/protoc-3.1.0-linux-x86_64.zip
@@ -21,6 +22,7 @@ before_install: |
       popd
       export PATH=$PROTOBUF_ROOT/bin:$PATH
     fi
+  fi
 install:
  - mkdir -p $HOME/.ccache
  - export PATH=/usr/lib/ccache:$PATH
@@ -28,5 +30,6 @@ install:
  - go get -d github.com/ry/v8worker2
  - (cd $GOPATH/src/github.com/ry/v8worker2 && ./tools/build.py)
 script:
+ - yarn lint-version
  - make lint
  - make test

package.json

@@ -2,6 +2,7 @@
   "name": "deno",
   "scripts": {
     "lint": "tslint -p tsconfig.json",
+    "lint-version": "tslint --version",
     "fmt": "prettier --write *.ts* *.js *.json"
   },
   "devDependencies": {
@@ -15,7 +16,7 @@
     "protobufjs": "^6.8.6",
     "source-map": "0.6.0",
     "tmp": "0.0.33",
-    "tslint": "^5.10.0",
+    "tslint": "5.10.0",
     "typescript": "^2.8.3",
     "uglify-js": "^2.8.29"
   },

yarn.lock

@@ -3598,7 +3598,7 @@ tslib@^1.8.0, tslib@^1.8.1:
   version "1.9.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.9.0.tgz#e37a86fda8cbbaf23a057f473c9f4dc64e5fc2e8"
 
-tslint@^5.10.0:
+tslint@5.10.0:
   version "5.10.0"
   resolved "https://registry.yarnpkg.com/tslint/-/tslint-5.10.0.tgz#11e26bccb88afa02dd0d9956cae3d4540b5f54c3"
   dependencies: