refactor dingtalk.tpl

etc/template/dingtalk.tpl

@@ -1,5 +1,7 @@
 #### {{if .IsRecovered}}<font color="#008800">S{{.Severity}} - Recovered - {{.RuleName}}</font>{{else}}<font color="#FF0000">S{{.Severity}} - Triggered - {{.RuleName}}</font>{{end}}
 
+---
+
 > - **规则标题**: {{.RuleName}}{{if .RuleNote}}
 > - **规则备注**: {{.RuleNote}}{{end}}
 > - **监控指标**: {{.TagsJSON}}
@@ -7,3 +9,5 @@
 > - **触发时值**: {{.TriggerValue}}{{end}}
 > - **发送时间**: {{timestamp}}
 
+---
+