Support auto-correction for Rails/Output

[koic]

This PR supports auto-correction for Rails/Output.

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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 (file) to the changelog folder named {change_type}_{change_description}.md if the new code introduces user-observable changes. See changelog entry format for details.
• 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.
• If this is a new cop, consider making a corresponding update to the Rails Style Guide.

[andyw8]

I think this shouldn't be considered a safe autocorrect. For example, depending on the Rails log level configuration, changing from puts to Rails.logger.debug could result in no output being shown.

[koic]

That's true! Thanks!