Use new github URL in README.
Use new github URL in README.

shinglyu/moztrap,mozilla/moztrap,mozilla/moztrap,mccarrmb/moztrap,shinglyu/moztrap,mccarrmb/moztrap,bobsilverberg/moztrap,shinglyu/moztrap,shinglyu/moztrap,mccarrmb/moztrap,mccarrmb/moztrap,mozilla/moztrap,shinglyu/moztrap,mccarrmb/moztrap,bobsilverberg/moztrap,bobsilverberg/moztrap,bobsilverberg/moztrap,mozilla/moztrap,mozilla/moztrap