message: Fix compression docs
diff: //!use cdrs::query::QueryBuilder;
  //!use cdrs::authenticators::NoneAuthenticator;
  //!use cdrs::compression::Compression;
  +//!use cdrs::transport::TransportTcp;
  //!
  //!let addr = "127.0.0.1:9042";
  //!let tcp_transport = TransportTcp::new(addr).unwrap();
  