docs: public List<RuleMenu> getRuleMenus() {
          String url = WxEndpoint.get("url.menu.get");
          String content = wxClient.get(url);
          logger.debug("get rule menus: {}", content);
          MenuWrapper menuWrapper = JsonMapper.nonEmptyMapper().fromJson(content, MenuWrapper.class);
          return menuWrapper.getRuleMenus();
      }