Merge pull request #2 from caugner/patch-2

Thanks!

Author: jeromewu

README.md

@@ -62,3 +62,4 @@ Learn how to build ffmpeg.js from stories:
 - [Part.1 Preparation](https://itnext.io/build-ffmpeg-webassembly-version-ffmpeg-js-part-1-preparation-ed12bf4c8fac)
 - [Part.2 Compile with Emscripten](https://itnext.io/build-ffmpeg-webassembly-version-ffmpeg-js-part-2-compile-with-emscripten-4c581e8c9a16)
 - [Part.3 ffmpeg.js v0.1.0 — Transcoding avi to mp4](https://itnext.io/build-ffmpeg-webassembly-version-ffmpeg-js-part-3-ffmpeg-js-v0-1-0-transcoding-avi-to-mp4-f729e503a397)
+- [Part.4 ffmpeg.js v0.2 — Web Worker and Libx264](https://medium.com/@jeromewus/build-ffmpeg-webassembly-version-ffmpeg-js-part-4-ffmpeg-js-v0-2-web-worker-and-libx264-d0596f1beb4e)