bb gh deploy should move the card to Deployed by


Pull request for [bb gh deploy should move the card to Deployed by](https://trello.com/c/P58rdZLE/1993-bb-gh-deploy-should-move-the-card-to-deployed-by).

I recommend reviewing refactor as a separate commit ;)    
this should go into separate module/func I think: `notify` or sth like that, possibly encapsulating multiple implementations, making such code DRY and notifying from bb cheap