docs(): updated changelog

Author: torkelo

CHANGELOG.md

@@ -10,6 +10,9 @@
 # 3.1.1 (unreleased / v3.1.x branch)
 * **IFrame embedding**: Fixed issue of using full iframe height, fixes [#5605](https://github.com/grafana/grafana/issues/5606)
 * **Panel PNG rendering**: Fixed issue detecting render completion, fixes [#5605](https://github.com/grafana/grafana/issues/5606)
+* **Elasticsearch**: Fixed issue with templating query and json parse error, fixes [#5615](https://github.com/grafana/grafana/issues/5615)
+* **Tech**: Upgraded JQuery to 2.2.4 to fix Security vulnerabilitie in 2.1.4, fixes [#5627](https://github.com/grafana/grafana/issues/5627)
+* **Graphite**: Fixed issue with mixed data sources and Graphite, fixes [#5617](https://github.com/grafana/grafana/issues/5617)
 
 # 3.1.0 stable (2016-07-12)