COMPATIBILITY: add new vendor require

assets/javascripts/wizard-custom.js

@@ -1,4 +1,6 @@
 //= require_tree_discourse discourse/app/lib
+//= require_tree_discourse discourse/app/mixins
+//
 
 //= require discourse/app/mixins/singleton
 //= require discourse/app/mixins/upload
@@ -66,6 +68,7 @@
 //= require template_include.js
 //= require caret_position.js
 //= require popper.js
+//= require uppy.js
 //= require bootstrap-modal.js
 //= require bootbox.js
 //= require discourse-shims