handshake: remove .clone() from Copy types

warning: using `clone` on a `Copy` type
   --> src/handshake/server.rs:159:21
    |
159 |                     self.config.clone(),
    |                     ^^^^^^^^^^^^^^^^^^^ help: try removing the `clone` call: `self.config`
    |
    = help: for further information visit https://rust-lang-nursery.github.io/rust-clippy/v0.0.212/index.html#clone_on_copy

src/handshake/client.rs

@@ -135,7 +135,7 @@ impl<S: Read + Write> HandshakeRole for ClientHandshake<S> {
                     stream,
                     tail,
                     Role::Client,
-                    self.config.clone(),
+                    self.config,
                 );
                 ProcessingResult::Done((websocket, result))
             }

src/handshake/server.rs

@@ -156,7 +156,7 @@ impl<S: Read + Write, C: Callback> HandshakeRole for ServerHandshake<S, C> {
                 let websocket = WebSocket::from_raw_socket(
                     stream,
                     Role::Server,
-                    self.config.clone(),
+                    self.config,
                 );
                 ProcessingResult::Done(websocket)
             }