remove versions/osx combinaions from CI target (too much)
remove versions/osx combinaions from CI target (too much)

cosmo0920/msgpack-ruby,cosmo0920/msgpack-ruby,ojundt/msgpack-ruby,msgpack/msgpack-ruby,msgpack/msgpack-ruby,ojundt/msgpack-ruby,msgpack/msgpack-ruby,ojundt/msgpack-ruby,cosmo0920/msgpack-ruby,cosmo0920/msgpack-ruby,ojundt/msgpack-ruby