update dispatcher.js to use ES module syntax

app/assets/javascripts/dispatcher.js

@@ -34,7 +34,6 @@
 /* global ShortcutsWiki */
 
 import Issue from './issue';
-
 import BindInOut from './behaviors/bind_in_out';
 import DeleteModal from './branches/branches_delete_modal';
 import Group from './group';
@@ -54,8 +53,7 @@ import AutoWidthDropdownSelect from './issuable/auto_width_dropdown_select';
 import UsersSelect from './users_select';
 import RefSelectDropdown from './ref_select_dropdown';
 import GfmAutoComplete from './gfm_auto_complete';
-
-const ShortcutsBlob = require('./shortcuts_blob');
+import ShortcutsBlob from './shortcuts_blob';
 
 (function() {
   var Dispatcher;