Docs: Updated changelog for 6.1.4

CHANGELOG.md

 # 6.2.0 (unreleased)
 
+# 6.1.4 (2019-04-16)
+
+### Bug Fixes
+  * **DataPanel**: Added missing built-in interval variables to scopedVars. [#16556](https://github.com/grafana/grafana/pull/16556), [@torkelo](https://github.com/torkelo)
+  * **Explore**: Adds maxDataPoints to data source query options . [#16513](https://github.com/grafana/grafana/pull/16513), [@hugohaggmark](https://github.com/hugohaggmark)
+  * **Explore**: Fixes so intervals are recalculated on run query. [#16510](https://github.com/grafana/grafana/pull/16510), [@hugohaggmark](https://github.com/hugohaggmark)
+  * **Heatmap**: Fix for empty graph when panel is too narrow (#16378). [#16460](https://github.com/grafana/grafana/pull/16460), [@alexanderzobnin](https://github.com/alexanderzobnin)
+  * **Heatmap**: Fixed auto decimals when bucket name is not number. [#16609](https://github.com/grafana/grafana/pull/16609), [@torkelo](https://github.com/torkelo)
+  * **QueryInspector**: Now shows error responses again. [#16514](https://github.com/grafana/grafana/pull/16514), [@torkelo](https://github.com/torkelo)
+
 # 6.1.3 (2019-04-09)
 
 ### Bug Fixes