Added mono to list of supported platforms in README
Added mono to list of supported platforms in README

hnafar/IronJS,xamarin/IronJS,hnafar/IronJS,fholm/IronJS,xamarin/IronJS,fholm/IronJS,xamarin/IronJS,hnafar/IronJS,hnafar/IronJS,hnafar/IronJS,fholm/IronJS,xamarin/IronJS,fholm/IronJS