docs(changelog): add filter for org switcher

closes grafana#2609

Author: bergquist

CHANGELOG.md

@@ -6,6 +6,7 @@
 * **Localization**: Week start day now dependant on browser locale setting, closes [#3003](https://github.com/grafana/grafana/issues/3003)
 * **Templating**: Update panel repeats for variables that change on time refresh, closes [#5021](https://github.com/grafana/grafana/issues/5021)
 * **Elasticsearch**: Support to set Precision Threshold for Unique Count metric, closes [#4689](https://github.com/grafana/grafana/issues/4689)
+* **Navigation**: Add search to org swithcer, closes [#2609](https://github.com/grafana/grafana/issues/2609)
 
 # 3.1.2 (unreleased)
 * **Templating**: Fixed issue when combining row & panel repeats, fixes [#5790](https://github.com/grafana/grafana/issues/5790)