message: add different types of connection to cluster
diff: @@ -19,9 +19,9 @@ fn main() {
  let cluster = Cluster::new(vec![_ADDR]);
  let mut no_compression = cluster.connect(RoundRobin::new(), NoneAuthenticator {})
  .expect("No compression connection error");
  - let mut lz4_compression = cluster.connect(RoundRobin::new(), NoneAuthenticator {})
  + let mut lz4_compression = cluster.connect_lz4(RoundRobin::new(), NoneAuthenticator {})
  .expect("LZ4 compression connection error");
  - let mut snappy_compression = cluster.connect(RoundRobin::new(), NoneAuthenticator {})
  + let mut snappy_compression = cluster.connect_snappy(RoundRobin::new(), NoneAuthenticator {})
  .expect("Snappy compression connection error");
  create_keyspace(&mut no_compression);
  