Update application.js

Author: Yuma Soga

app/assets/javascripts/application.js

@@ -10,7 +10,7 @@
 // Read Sprockets README (https://github.com/rails/sprockets#sprockets-directives) for details
 // about supported directives.
 //
-//= require jquery
+//= require jquery3
 //= require jquery_ujs
 //= require rails-ujs
 //= require turbolinks