changelog: adds note about closing #10975.

CHANGELOG.md

@@ -10,6 +10,7 @@
 * **Prometheus**: Fixes bundled Prometheus 2.0 dashboard [#11016](https://github.com/grafana/grafana/issues/11016), thx [@roidelapluie](https://github.com/roidelapluie)
 * **Sidemenu**: Profile menu "invisible" when gravatar is disabled [#11097](https://github.com/grafana/grafana/issues/11097)
 * **Dashboard**: Fixes a bug with resizeable handles for panels [#11103](https://github.com/grafana/grafana/issues/11103)
+* **Alerting**: Telegram inline image mode fails when caption too long [#10975](https://github.com/grafana/grafana/issues/10975)
 
 # 5.0.0-stable (2018-03-01)