code: public static JsonRtn updateGroup(License license, Group group) {
          if (group == null) {
              return JsonRtnUtil.buildFailureJsonRtn(JsonRtn.class, "missing group");
          }
  
          return HttpUtil.postBodyRequest(WechatRequest.UPDATE_GROUP, license, new GroupWarpper(group), GroupJsonRtn.class);
      }
docs: TODO-Shunli: now update group always failed, tip system error, check later