message: fixed readme bug
diff: @@ -31,7 +31,7 @@ CDRS is Apache **C**assandra **d**river written in pure **R**u**s**t.
  Add CDRS tokio to your `Cargo.toml` file as a dependency:
  ```toml
  -cdrs-tokio = "1.0"
  +cdrs-tokio = "desired version"
  ```
  ```rust
  @@ -42,7 +42,7 @@ use cdrs_tokio::load_balancing::RoundRobin;
  use cdrs_tokio::query::*;
  #[tokio::main]
  -fn main() {
  +async fn main() {
  let node = NodeTcpConfigBuilder::new("127.0.0.1:9042", NoneAuthenticator {}).build();
  let cluster_config = ClusterTcpConfig(vec![node]);
  let no_compression =
  