fix "main" not pointed at distributable file

Author: alexkrolick

package.json

@@ -13,7 +13,7 @@
     "type": "git",
     "url": "https://github.com/zenoamaro/react-quill.git"
   },
-  "main": "src/index.js",
+  "main": "dist/react-quill.min.js",
   "scripts": {
     "test": "make test",
     "build": "make build"