Commits on May 26, 2021

1. Add new Lint/EmptyInPattern cop …

   This PR adds new `Lint/EmptyInPattern` cop for Ruby 2.7's pattern matching.
   It checks for the presence of `in` branches without a body.
   
   ```ruby
   # bad
   case condition
   in [a]
     do_something
   in [a, b]
   end
   
   # good
   case condition
   in [a]
     do_something
   in [a, b]
     nil
   end
   
   # good - AllowComments: true (default)
   case condition
   in [a]
     do_something
   in [a, b]
     # noop
   end
   
   # bad - AllowComments: false
   case condition
   in [a]
     do_something
   in [a, b]
     # noop
   end
   ```
   
   This cop is similar to `Lint/EmptyWhen`, but with different supported
   syntax and Ruby version (requires 2.7 or higher).
   
   And this PR use rubocop/rubocop-ast#183 feature,
   so it requires RuboCop AST 1.6.0 or higher.

   

   koic committed May 26, 2021
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