docs: updated changelog with info on merged PR #8405

CHANGELOG.md

@@ -1,5 +1,8 @@
 # 4.4.0 (unreleased)
+
+## Enhancements
 * **Elasticsearch**: Added filter aggregation label [#8420](https://github.com/grafana/grafana/pull/8420), thx [@tianzk](github.com/tianzk)
+* **Sensu**: Added option for source and handler [#8405](https://github.com/grafana/grafana/pull/8405), thx [@joemiller](github.com/joemiller)
 
 # 4.3.2 (upcoming patch release)