docs(readme): Add babel injection note

Awk34 · Awk34 · commit e7087e6ce906 · 2015-06-22T10:42:13.000-04:00
diff --git a/readme.md b/readme.md
@@ -57,6 +57,7 @@ A grunt task looks for new files in your `client/app` and `client/components` fo
 * `css` files into `client/index.html`
 * `js` files into `client/index.html`
 * `coffeescript` temp `js` files into `client/index.html`
+* `babel` temp `js` files into `client/index.html`
 
 ## Generators
 
