changelog: add notes about closing #11233

[skip ci]

CHANGELOG.md

@@ -9,6 +9,7 @@
 * **Dashboard**: Fix so panel titles doesn't wrap [#11074](https://github.com/grafana/grafana/issues/11074)
 * **Dashboard**: Prevent double-click when saving dashboard [#11963](https://github.com/grafana/grafana/issues/11963)
 * **Dashboard**: AutoFocus the add-panel search filter [#12189](https://github.com/grafana/grafana/pull/12189) thx [@ryantxu](https://github.com/ryantxu)
+* **Units**: W/m2 (energy), l/h (flow) and kPa (pressure) [#11233](https://github.com/grafana/grafana/pull/11233), thx [@flopp999](https://github.com/flopp999)
 
 # 5.2.0-beta1 (2018-06-05)