docs: public void updateMpNews(String mediaId, int index, MpArticle article) {
          String url = WxEndpoint.get("url.material.mpnews.update");
          Map<String, Object> request = new HashMap<>();
  
          request.put("media_id", mediaId);
          request.put("index", index);
          request.put("articles", article);
  
          String json = JsonMapper.nonEmptyMapper().toJson(request);
          logger.info("update mpnews: {}", json);
          wxClient.post(url, json);
      }