Update dist README.md

dist/README.md

@@ -3,10 +3,11 @@
 Explanation of Build Files
 ---
 
-| UMD | Size | CommonJS | Size |
+| UMD | Size | CommonJS | Size | ES Module | Size |
-| ---- | ---- | ---- | ---- |
+| ---- | ---- | ---- | ---- | ---- | ---- |
-| dist/hotkeys.js | 8.37kb | dist/hotkeys.common.js | 8.13kb |
+| hotkeys.js | 8.37kb | hotkeys.common.js | 8.13kb | hotkeys.esm.js | 8.12kb |
-| dist/hotkeys.min.js | 3.62kb (gzipped: 1.73kb) | dist/hotkeys.common.min.js | (gzipped: 1.84kb) |
+| hotkeys.min.js | 3.62kb (gzipped: 1.73kb) | hotkeys.common.min.js | (gzipped: 1.84kb) | - | - |
 
 - [UMD](https://github.com/umdjs/umd): UMD builds can be used directly in the browser via a `<script>` tag. 
-- [CommonJS](http://wiki.commonjs.org/wiki/Modules/1.1): CommonJS builds are intended for use with older bundlers like [browserify](http://browserify.org/) or [webpack](https://webpack.github.io/). 
+- [CommonJS](http://wiki.commonjs.org/wiki/Modules/1.1): CommonJS builds are intended for use with older bundlers like [browserify](http://browserify.org/) or [webpack 1](https://webpack.github.io/). 
+- [ES Module](http://exploringjs.com/es6/ch_modules.html): ES module builds are intended for use with modern bundlers like [webpack 2](https://webpack.js.org/) or [rollup](http://rollupjs.org/).