docs(changelog): adds notes about closing #6905

CHANGELOG.md

@@ -20,6 +20,7 @@
 * **API**: HTTP API for deleting org returning incorrect message for a non-existing org [#6679](https://github.com/grafana/grafana/issues/6679)
 * **Dashboard**: Posting empty dashboard result in corrupted dashboard [#5443](https://github.com/grafana/grafana/issues/5443)
 * **Logging**: Fixed logging level confing issue [#6978](https://github.com/grafana/grafana/issues/6978)
+* **Notifications**: Remove html escaping the email subject. [#6905](https://github.com/grafana/grafana/issues/6905)
 
 # 4.0.2 (2016-12-08)