Support rubocop 1.22.2 with an associated channel

[BrianHawley]

Please add a rubocop-1-22-2 channel to support rubocop 1.22.2.

It's notable that 1.22.0 and 1.22.1 are also missing, but 1.22.2 would be the priority because it's the latest and because of its bug fixes.

[f-moya]

Hi 👋🏼 , done https://github.com/codeclimate/codeclimate-rubocop/tree/channel/rubocop-1-22-2

[BrianHawley]

Could you add a commit to change the version of rubocop in the channel to 1.22.2 instead of 1.20.0, or should I make a PR to do that?

I'll make a PR. @fede-moya

Update: #302 is passing tests and ready to merge.

[BrianHawley]

@fede-moya I don't know if the codeclimate service includes the changes in #302 in their rubocop-1-22-2 channel yet. Are you able to verify this?