Allow the term "Mastercard"
Allow the term "Mastercard"

The new cop marks the term "Mastercard" as offensive.

Although they should rename the company to Maincard, that's not going to happen soon.

This PR allows the term Mastercard by default.
maxjacobson/rubocop,maxjacobson/rubocop,maxjacobson/rubocop,bbatsov/rubocop,bbatsov/rubocop,rrosenblum/rubocop,tejasbubane/rubocop,tejasbubane/rubocop,rrosenblum/rubocop,tejasbubane/rubocop,rrosenblum/rubocop