changelog: add notes about closing #13641 #13650

[skip ci]

CHANGELOG.md

@@ -19,6 +19,9 @@
 * **Render**: Fix PhantomJS render of graph panel when legend displayed as table to the right [#13616](https://github.com/grafana/grafana/issues/13616)
 * **Stackdriver**: Filter option disappears after removing initial filter [#13607](https://github.com/grafana/grafana/issues/13607)
 * **Variables**: Fix nesting variables leads to exception and missing refresh [#13628](https://github.com/grafana/grafana/issues/13628)
+* **Variables**: Prometheus: Single letter labels are not supported [#13641](https://github.com/grafana/grafana/issues/13641)
+* **Graph**: Fix graph time formatting for Last 24h ranges [#13650](https://github.com/grafana/grafana/issues/13650)
+* **HTTP API**: Fix /api/org/users so that query and limit querystrings works
 
 # 5.3.0 (2018-10-10)