### New features

* [#1434](https://github.com/rubocop/rubocop-rails/pull/1434): Pluginfy RuboCop Rails. ([@koic][])

### Bug fixes

* [#1071](https://github.com/rubocop/rubocop-rails/issues/1071): Fix `Rails/FilePath` cop to correctly handle `File.join` with variables and ignore leading and multiple slashes in string literal arguments for `Rails.root.join` and `File.join`. ([@ydakuka][])
* [#912](https://github.com/rubocop/rubocop-rails/issues/912): Enhance `Rails/Delegate` by adding delegation detection for `self.class`, constants, class variables, global variables, and instance variables. ([@ydakuka][])

[@koic]: https://github.com/koic
[@ydakuka]: https://github.com/ydakuka
