updated dist file with ReactDOM

Author: kiran

webpack.config.dist.js

@@ -30,7 +30,7 @@ module.exports = {
         amd: 'react'
       },
       'react-dom': {
-        root: 'react-dom',
+        root: 'ReactDOM',
         commonjs2: 'react-dom',
         commonjs: 'react-dom',
         amd: 'react-dom'