message: WebSocket Client: added Sec-WebSocket-Version header.
diff: @@ -1912,6 +1912,7 @@ static PHP_METHOD(swoole_http_client, upgrade)
  sw_add_assoc_string(hcc->request_header, "Connection", "Upgrade", 1);
  sw_add_assoc_string(hcc->request_header, "Upgrade", "websocket", 1);
  + sw_add_assoc_string(hcc->request_header, "Sec-WebSocket-Version", SW_WEBSOCKET_VERSION, 1);
  int encoded_value_len = 0;
  