bbatsov/rubocop

### New features

* [#6126](https://github.com/rubocop/rubocop/pull/6126): Add an experimental strict mode to `Style/MutableConstant` that will freeze all constants, rather than just literals. ([@rrosenblum][])

### Bug fixes

* [#6765](https://github.com/rubocop/rubocop/pull/6765): Fix false positives in keyword arguments for `Style/MethodCallWithArgsParentheses` `omit_parentheses`. ([@gsamokovarov][])
* [#6763](https://github.com/rubocop/rubocop/pull/6763): Fix false positives in range literals for `Style/MethodCallWithArgsParentheses` `omit_parentheses`. ([@gsamokovarov][])
* [#6748](https://github.com/rubocop/rubocop/issues/6748): Fix `Style/RaiseArgs` auto-correction breaking in contexts that require parentheses. ([@drenmi][])
* [#6751](https://github.com/rubocop/rubocop/issues/6751): Prevent `Style/OneLineConditional` from breaking on `retry` and `break` keywords. ([@drenmi][])
* [#6755](https://github.com/rubocop/rubocop/issues/6755): Prevent `Style/TrailingCommaInArgument` from breaking when a safe method call is chained on the offending method. ([@drenmi][], [@hoshinotsuyoshi][])

### Changes

* [#6766](https://github.com/rubocop/rubocop/pull/6766): Drop support for Ruby 2.2.0 and 2.2.1. ([@pocke][])
* [#6733](https://github.com/rubocop/rubocop/pull/6733): Warn duplicated keys in `.rubocop.yml`. ([@pocke][])
* [#6613](https://github.com/rubocop/rubocop/pull/6613): Mark `Style/ModuleFunction` as `SafeAutocorrect: false` and disable autocorrect by default. ([@dduugg][])

[@rrosenblum]: https://github.com/rrosenblum
[@gsamokovarov]: https://github.com/gsamokovarov
[@drenmi]: https://github.com/drenmi
[@hoshinotsuyoshi]: https://github.com/hoshinotsuyoshi
[@pocke]: https://github.com/pocke
[@dduugg]: https://github.com/dduugg