message: stop using `println!` to notify the handshake was ok
diff: @@ -57,7 +57,7 @@ impl<W: Sized+Write+Read> Connection<W> {
  0xffffffff => Err(Error::UnsupportedVersion),
  0x00000001 => Err(Error::InvalidRequest),
  0x00000002 => Err(Error::CrossedRequest),
  - 0x00000000 => { println!("HANDSHAKE OK"); Ok(conn) },
  + 0x00000000 => { info!("HANDSHAKE OK"); Ok(conn) },
  v => Err(Error::UnknownErrorCode(v)),
  }
  }
  