changelog: adds note about closing #7526

CHANGELOG.md

@@ -14,6 +14,7 @@
 * **Dashboard**: Adds shortcut for collapsing/expanding all rows [#552](https://github.com/grafana/grafana/issues/552), thx [@mtanda](https://github.com/mtanda)
 * **Alerting**: Adds de duping of alert notifications [#7632](https://github.com/grafana/grafana/pull/7632)
 * **Orgs**: Sharing dashboards using Grafana share feature will not redirect to correct org. [#1613](https://github.com/grafana/grafana/issues/1613)
+* **Pushover**: Add Pushover alert notifications [#7526](https://github.com/grafana/grafana/pull/7526) thx [@devkid](https://github.com/devkid)
 
 ## Minor Enhancements
 * **Optimzation**: Never issue refresh event when Grafana tab is not visible [#7218](https://github.com/grafana/grafana/issues/7218), thx [@mtanda](https://github.com/mtanda)