Travis: test only master branch
Travis: test only master branch

cffi/cffi,stassats/cffi,dkochmanski/cffi,mcna/cffi,3b/cffi,cffi/cffi,stassats/cffi,dkochmanski/cffi,3b/cffi,attila-lendvai/cffi,stassats/cffi,attila-lendvai/cffi,dkochmanski/cffi,cffi/cffi,3b/cffi,mcna/cffi