docs(): updated changelog

Author: torkelo

CHANGELOG.md

@@ -13,6 +13,7 @@
 * **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)
+* **Templating**: Fixed issue with template variable query was issued multiple times during dashboard load, fixes [#5637](https://github.com/grafana/grafana/issues/5637)
 
 # 3.1.0 stable (2016-07-12)