Added a check for the opt.in for in the users repositories

This is the simplest thing I could see working for a basic serverless opt.in strategy.
I would just transfer ownership of this repo to you or you could create an empty repo and change the name.
https://github.com/nisbus/resume.github.com.opt.in

BTW sorry for the indentation, Emacs insisted to keep it like this :).

Cheers,
   nisbus