message: added a single doc test
diff: @@ -18,6 +18,16 @@ pub struct TransportPlain {
  }
  impl TransportPlain {
  +
  + /// Constructs a new `TransportPlain`.
  + ///
  + /// # Examples
  + ///
  + /// ```
  + /// use cdrs::transport::TransportPlain;
  + /// let addr = "127.0.0.1:9042";
  + /// let tcp_transport = TransportPlain::new(addr).unwrap();
  + /// ```
  pub fn new(addr: &str) -> io::Result<TransportPlain> {
  TcpStream::connect(addr).map(|socket| TransportPlain {tcp: socket})
  }
  