Commits on May 17, 2020

1. Add EnforcedStyle for Style/DoubleNegation cop …

   This PR adds `EnforcedStyle` option for `Style/DoubleNegation` cop,
   and `EnforcedStyle: allowed_in_boolean_context` by default based on rubocop#7833 survey.
   
   ```ruby
   # @example EnforcedStyle: allowed_in_boolean_context (default)
   #   # good
   #   def foo?
   #     !!return_value
   #   end
   #
   # @example EnforcedStyle: always
   #   # bad
   #   def foo?
   #     !!return_value
   #   end
   ```
   
   Ruby will return the last evaluated value.
   
   This PR only supports simple contexts, such as the end of line value of
   method, and when using `return`.
   A complex contexts should also be supported, such as when branching with
   `if` and others in the future.

   

   koic committed May 17, 2020
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