Add standard header to protect .rubocop.yml
Add standard header to protect .rubocop.yml

https://trello.com/c/Cr2TnMtI/193-make-it-easier-to-agree-with-rubocop-govuk

This follows the convention established in [1].

[1]: https://github.com/alphagov/content-publisher/pull/2411

alphagov/local-links-manager,alphagov/local-links-manager,alphagov/local-links-manager