Added documentation about needed version of platform.
Added documentation about needed version of platform.

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