Fix application.js

Author: Yuma Soga

app/assets/javascripts/application.js

@@ -10,9 +10,11 @@
 // Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
 // about supported directives.
 //
+//= require jquery
+//= require jquery_ujs
 //= require rails-ujs
+//= require_tree .
 //= require turbolinks
-//= require jquery
 //= require toastr
 //= require popper
 //= require bootstrap