fix(readme): Corrected file extension in example

Reported by @vermilion1, fixes #171

Author: passy

readme.md

@@ -188,7 +188,7 @@ By default, generators produce unannotated code. Without annotations, AngularJS'
 yo angular:controller user --minsafe
 ```
 
-Produces `app/controller/user.coffee`:
+Produces `app/controller/user.js`:
 ```javascript
 angular.module('myMod').controller('UserCtrl', ['$scope', function ($scope) {
   // ...