Merge branch 'remove-pretty-time' into 'master'

Remove pretty time from main.js

See merge request gitlab-org/gitlab-ce!15459

app/assets/javascripts/main.js

@@ -29,7 +29,6 @@ import './commit/image_file';
 // lib/utils
 import { handleLocationHash } from './lib/utils/common_utils';
 import './lib/utils/datetime_utility';
-import './lib/utils/pretty_time';
 import './lib/utils/url_utility';
 
 // behaviors