docs(changelog): add note about closing #6292

CHANGELOG.md

@@ -32,6 +32,7 @@
 * **Elasticsearch**: Fix for displaying IP address used in terms aggregations, fixes [#4393](https://github.com/grafana/grafana/pull/4393)
 * **PNG Rendering**: Fix for server side rendering when using auth proxy, fixes [#5906](https://github.com/grafana/grafana/pull/5906)
 * **OpenTSDB**: Fixed multi-value nested templating for opentsdb, fixes [#6455](https://github.com/grafana/grafana/pull/6455)
+* **Playlist**: Remove playlist items when dashboard is removed, fixes [#6292](https://github.com/grafana/grafana/issues/6292)
 
 # 3.1.2 (unreleased)
 * **Templating**: Fixed issue when combining row & panel repeats, fixes [#5790](https://github.com/grafana/grafana/issues/5790)