Fix rubocop newline complain

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/models/repository.rb

@@ -1369,4 +1369,4 @@ def keep_around_ref_name(sha)
   def repository_event(event, tags = {})
     Gitlab::Metrics.add_event(event, { path: path_with_namespace }.merge(tags))
   end
-end
\ No newline at end of file
+end