Merge pull request #207 from felixmosh/enable-tree-shaking

Add 'module' entry to allow Webpack to tree shake it

Author: christopherthielen

package.json

@@ -64,6 +64,7 @@
   "typings": "lib/index.d.ts",
   "main": "lib/index.js",
   "jsnext:main": "lib-esm/index.js",
+  "module": "lib-esm/index.js",
   "license": "MIT",
   "devDependencies": {
     "@types/jasmine": "^2.8.8",