Fixes #470
This commit increases size:
out/release/gen/bundle/main.js 7.3M -> 7.9M
out/release/gen/bundle/main.js.map 11M -> 12M
out/release/gen/snapshot_deno.bin 34M -> 37M
out/release/deno 49M -> 53M
Note the amount in the JS code added is quite small:
4.0K node_modules/text-encoding/index.js
4.0K node_modules/@types/text-encoding/index.d.ts
4.0K js/text_encoding.ts
Unclear to me what is causing the jump in snapshot size.
