Thanks for your pull request, and sorry for the delay.
But I do not maintain this plugin actively now, so I will not merge it.

I recommend opening a pull request or an issue to add the cop to rubocop-rails project if you need it. You can use the code in this repository under the LICENSE.

Personally I think this feature is acceptable for rubocop-rails, because it already has a similar cop that orders callbacks. https://github.com/rubocop-hq/rubocop-rails/blob/7098462525bec5f16bb6ce9e3e62907862319db8/lib/rubocop/cop/rails/active_record_callbacks_order.rb

I'll archive this repository after a while.

Thanks.

Thanks for the reply! I understand and thank you for the suggestion.