Fixing a typo

Author: ThePeterMick

assets/js/app.js

@@ -1,6 +1,6 @@
 // loads the Bootstrap jQuery plugins
 import 'bootstrap-sass/assets/javascripts/bootstrap/transition.js';
-import 'bootstrap-sass/assets/javascripts/bootstrap/alerts.js';
+import 'bootstrap-sass/assets/javascripts/bootstrap/alert.js';
 import 'bootstrap-sass/assets/javascripts/bootstrap/collapse.js';
 import 'bootstrap-sass/assets/javascripts/bootstrap/dropdown.js';
 import 'bootstrap-sass/assets/javascripts/bootstrap/modal.js';