changelog: add notes about closing #11968

[skip ci]

CHANGELOG.md

@@ -14,6 +14,7 @@
 
 * **Plugins**: Handle errors correctly when loading datasource plugin [#12383](https://github.com/grafana/grafana/pull/12383) thx [@rozetko](https://github.com/rozetko)
 * **Render**: Enhance error message if phantomjs executable is not found [#11868](https://github.com/grafana/grafana/issues/11868)
+* **Dashboard**: Set correct text in drop down when variable is present in url [#11968](https://github.com/grafana/grafana/issues/11968)
 
 # 5.2.0-beta3 (2018-06-21)