Remove module property from package.json

Fixes #1574

Author: cookpete

package.json

@@ -4,7 +4,6 @@
   "description": "A React component for playing a variety of URLs, including file paths, YouTube, Facebook, Twitch, SoundCloud, Streamable, Vimeo, Wistia and DailyMotion",
   "main": "lib/index.js",
   "typings": "lib/index.d.ts",
-  "module": "es6/index.js",
   "scripts": {
     "clean": "rimraf lib lazy demo coverage *.d.ts",
     "start": "webpack-dev-server --config webpack/config.babel.js",