Update rubocop-rspec

[BrianHawley]

Update rubocop-rspec to 2.2.0 In channel 1-12-1, because of Ruby 2.4 compatibility. Update rubocop-rspec to 2.4.0 in channel 1-18-3.

Only mentioned those specific channels because they're not yet released.

[BrianHawley]

This might be considered a dup of #271.

[f-moya]

Feel free to open prs for rubocop-rspec, I won't be performing that update this week but I could merge work.

[BrianHawley]

@fede-moya I opened the PRs to get channels 1-12-1 and 1-18-3 up to date.

[BrianHawley]

@fede-moya as with the rubocop-rails update issue, the channel that I personally need the updates for the most is 1-12-1, so PR #295 is the critical one for me to get in there.

[f-moya]

@BrianHawley done ! Thank you for opening prs 👏🏼