changelog: adds note for #15182

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### Minor
 * **Pushover**: Adds support for images in pushover notifier [#10780](https://github.com/grafana/grafana/issues/10780), thx [@jpenalbae](https://github.com/jpenalbae)
 * **Cloudwatch**: Add AWS/Neptune metrics [#14231](https://github.com/grafana/grafana/issues/14231), thx [@tcpatterson](https://github.com/tcpatterson)
+* **Stackdriver**: Template variables in filters using globbing format [#15182](https://github.com/grafana/grafana/issues/15182)
 
 # 6.0.0-beta1 (2019-01-30)