Puma 6 gemspec - required_ruby_version to Ruby 2.4, RuboCop updates #2919
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Description
The Puma 5 gemspec sets Ruby version compatibility to Ruby 2.2 and later. Update that to Ruby 2.4.
Remove Ruby 2.2 and 2.3 from CI testing.
This allows using a newer version of RuboCop. Updated the versions used, and disabled a few Cops to keep CI passing.
See Issue #1811 'Rev the minimum Ruby Version >= Ruby 2.5' from June 2018.
We could jump to 2.5...
Your checklist for this pull request
[ci skip]
to the title of the PR.#issue
" to the PR description or my commit messages.