Support auto-correction for Naming/BinaryOperatorParameterName

[koic]

This PR supports auto-correction for Naming/BinaryOperatorParameterName.

---

Before submitting the PR make sure the following are checked:

• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
• The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
• Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[bbatsov]

The changes seem solid. I'd suggest starting to use the new changelog directory instead of modifying the CHANGELOG.md directly to avoid having to deal with the merge conflicts. Just realized we updated the contribution guidelines, but not the PR template to recommend creating entries in the folder.

[koic]

I updated this PR with the new method of updating the changelog. I was used to updating the changelog directly, so I chose that 😅

[bbatsov]

Thanks!