fix

src/main/java/cn/qg/holmes/utils/DingdingUtils.java

@@ -116,6 +116,7 @@ public class DingdingUtils {
         Map<String, Object> atMap = new HashMap<>();
         atMap.put("isAtAll", true);
         markdown.put("at", atMap);
+        markdown.put("msgtype", "markdown");
         String content = "亲爱的" + issue.getAssignee().getName() + "同学，你有一个BUG已经超过4个小时未解决，请多注意哦！\n\n";
         String bugUrl = "http://jira2.quantgroup.cn/browse/" + issue.getKey();
         content += "BUG具体信息：[" + issue.getSummary().replace("\"", "") + "](" + bugUrl + ")\n\n";