Commits on Jan 8, 2021

1. Fix duplicate extension cop versions when rubocop -V …

   Follow rubocop#9349 (comment).
   
   This PR fixes duplicate extension cop versions when `rubocop -V`.
   
   The following is an example:
   
   ```yaml
   # ext.yml
   require:
     - rubocop-rspec
   
   # .rubocop.yml
   inherit_from: ext.yml
   require:
     - rubocop-performance
     - rubocop-rspec
   
   ## Before
   
   If there are duplicate requires, extension cop display will also be duplicated.
   Duplicate requires will be displayed in duplicate.
   
   ```console
   % rubocop -V
   1.8.0 (using Parser 3.0.0.0, rubocop-ast 1.4.0, running on ruby 2.7.2 x86_64-darwin19)
     - rubocop-performance 1.9.2
     - rubocop-rspec 2.0.0
     - rubocop-rspec 2.0.0
   ```
   
   ## After
   
   Even if there are duplicate requires, they will only be displayed once per extension cop.
   
   ```console
   % rubocop -V
   1.8.0 (using Parser 3.0.0.0, rubocop-ast 1.4.0, running on ruby 2.7.2 x86_64-darwin19)
     - rubocop-performance 1.9.2
     - rubocop-rspec 2.0.0
   ```

   

   koic committed Jan 8, 2021
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