improve client test, I think we are OK, both gorilla(websocket) and ws(websocket2) have the same API, it's time to combine them but first let's give a lower level of api available for users if they want to manage the routines by theirselves (i.e on unix they can use netpolls manually)

Former-commit-id: 3209a7490939bce913732c1375190b0771ba63ae

_examples/websocket/go-client/client/main.go

@@ -21,8 +21,7 @@ $ go run main.go
 >> hi!
 */
 func main() {
-	// `websocket.DialContext` is also available.
-	c, err := websocket.Dial(url, websocket.ConnectionConfig{})
+	c, err := websocket.Dial(nil, url, websocket.ConnectionConfig{})
 	if err != nil {
 		panic(err)
 	}