Commits on Apr 12, 2021

1. Add Performance/MapCompact cop …

   Follow rubocop#211 (comment)
   
   This PR adds `Performance/MapCompact` cop
   
   In Ruby 2.7, `Enumerable#filter_map` has been added.
   
   This cop identifies places where `map { ... }.compact` can be replaced by `filter_map`.
   It is marked as unsafe auto-correction by default because `map { ... }.compact`
   that is not compatible with `filter_map`.
   
   The following is good and bad cases.
   
   ```ruby
   # bad
   ary.map(&:foo).compact
   ary.collect(&:foo).compact
   
   # good
   ary.filter_map(&:foo)
   ary.map(&:foo).compact!
   ```

   

   koic committed Apr 12, 2021
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