Update CONTRIBUTING.md
Update CONTRIBUTING.md

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simkimsia/crud,johanmeiring/crud,ankr/crud,bcrowe/crud,FriendsOfCake/crud-json-api,Spriz/crud,bravo-kernel/crud,pwerken/cakephp-crud,dakota/crud,deizel/crud,ojengwa/crud,davidyell/crud,FriendsOfCake/crud