babel.js in webpacker-1.2

- old
+ new

@@ -1,10 +1,5 @@
 module.exports = {
   test: /\.js(\.erb)?$/,
   exclude: /node_modules/,
-  loader: 'babel-loader',
-  options: {
-    presets: [
-      ['env', { modules: false }]
-    ]
-  }
+  loader: 'babel-loader'
 }