changelog: note for DingDing notifier

CHANGELOG.md

@@ -11,6 +11,7 @@ Pull Request: [#8472](https://github.com/grafana/grafana/pull/8472)
 * **Sensu**: Added option for source and handler [#8405](https://github.com/grafana/grafana/pull/8405), thx [@joemiller](github.com/joemiller)
 * **CSV**: Configurable csv export datetime format [#8058](https://github.com/grafana/grafana/issues/8058), thx [@cederigo](github.com/cederigo)
 * **Table Panel**: Column style that preserves formatting/indentation (like pre tag) [#6617](https://github.com/grafana/grafana/issues/6617)
+* **DingDing**: Add DingDing Alert Notifier [#8473](https://github.com/grafana/grafana/pull/8473) thx [@jiamliang](https://github.com/jiamliang)
 
 ## Minor Enhancements