code: func NewMSSelect(c io.ReadWriteCloser, proto string) Multistream {
  	return &lazyClientConn{
  		protos: []string{ProtocolID, proto},
  		con:    c,
  	}
  }
docs: // NewMSSelect returns a new Multistream which is able to perform
  // protocol selection with a MultistreamMuxer.