Add Carthage support badge.
Add Carthage support badge.

paulz/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,jmoody/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,paulz/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory,AmitaiB/FontAwesomeIconFactory,nschum/FontAwesomeIconFactory