changelog: add notes about closing #15765

CHANGELOG.md

@@ -11,6 +11,7 @@
 
 ### Bug Fixes
 * **Metrics**: Fixes broken usagestats metrics for /metrics [#15651](https://github.com/grafana/grafana/issues/15651)
+* **Dashboard**: Fixes kiosk mode should have &kiosk appended to the url [#15765](https://github.com/grafana/grafana/issues/15765)
 
 # 6.0.0 stable (2019-02-25)