Use double quotes for consistency in app.js (phoenixframework#2813)

Author: leveloid

installer/templates/phx_assets/webpack/app.js

@@ -1,7 +1,7 @@
 // We need to import the CSS so that webpack will load it.
 // The ExtractTextPlugin is used to separate it out into
 // its own CSS file.
-import css from '../css/app.css';
+import css from "../css/app.css";
 
 // webpack automatically bundles all modules in your
 // entry points. Those entry points can be configured