message: fix keep-alive option no effect.
diff: @@ -459,7 +459,7 @@ static int http_client_execute(zval *zobject, char *uri, zend_size_t uri_len, zv
  if (php_swoole_array_get_value(vht, "keep_alive", ztmp))
  {
  convert_to_boolean(ztmp);
  - http->keep_alive = (int) Z_LVAL_P(ztmp);
  + http->keep_alive = Z_BVAL_P(ztmp);
  }
  /**
  * websocket mask
  