Housekeeping for the gem: require Ruby3, updates to newest Rubocop with rubocop-rake and rubocop-rspec plugins #85
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With this PR I intend to lay the groundwork for a 3.0 release of the gem.
As this PR will drop support for Ruby 2.x a major version bump is needed.
This PR does
>= 3.0.0
rubocop-rake
andrubocop-rspec
and fixes what was offcloses #70