message: Correct README example
diff: @@ -46,18 +46,29 @@ use cdrs_tokio::authenticators::NoneAuthenticatorProvider;
  use cdrs_tokio::cluster::session::{new as new_session};
  use cdrs_tokio::cluster::{ClusterTcpConfig, NodeTcpConfigBuilder};
  use cdrs_tokio::load_balancing::RoundRobin;
  +use cdrs_tokio::retry::DefaultRetryPolicy;
  use cdrs_tokio::query::*;
  +use std::sync::Arc;
  #[tokio::main]
  async fn main() {
  - let node = NodeTcpConfigBuilder::new("127.0.0.1:9042", Arc::new(NoneAuthenticatorProvider)).build();
  + let node =
  + NodeTcpConfigBuilder::new("127.0.0.1:9042", Arc::new(NoneAuthenticatorProvider)).build();
  let cluster_config = ClusterTcpConfig(vec![node]);
  - let no_compression =
  - new_session(&cluster_config, RoundRobin::new()).await.expect("session should be created");
  + let no_compression = new_session(
  + &cluster_config,
  + RoundRobin::new(),
  + Box::new(DefaultRetryPolicy::default()),
  + )
  + .await
  + .expect("session should be created");
  let create_ks = "CREATE KEYSPACE IF NOT EXISTS test_ks WITH REPLICATION = { \
  'class' : 'SimpleStrategy', 'replication_factor' : 1 };";
  - no_compression.query(create_ks).await.expect("Keyspace create error");
  + no_compression
  + .query(create_ks)
  + .await
  + .expect("Keyspace create error");
  }
  ```
  