Remove superfluous import

app/assets/javascripts/main.js

@@ -24,7 +24,6 @@ import initLayoutNav from './layout_nav';
 import './feature_highlight/feature_highlight_options';
 import LazyLoader from './lazy_loader';
 import initLogoAnimation from './logo';
-import './milestone_select';
 import './frequent_items';
 import initBreadcrumbs from './breadcrumb';
 import initDispatcher from './dispatcher';