docs(): updated changelog

CHANGELOG.md

@@ -4,6 +4,7 @@
 * **Graph Panel**: Log base scale on right Y-axis had no effect, max value calc was not applied, [#6534](https://github.com/grafana/grafana/issues/6534)
 * **Graph Panel**: Bar width if bars was only used in series override, [#6528](https://github.com/grafana/grafana/issues/6528)
 * **UI/Browser**: Fixed issue with page/view header gradient border not showing in Safari, [#6530](https://github.com/grafana/grafana/issues/6530)
+* **Cloudwatch**: Fixed cloudwatch datasource requesting to many datapoints, [#6544](https://github.com/grafana/grafana/issues/6544)
 
 # 4.0-beta1 (2016-11-09)