docs: updated changelog

CHANGELOG.md

@@ -19,6 +19,7 @@
 
 ## Fixes
 * **Table Panel**: Fixed annotation display in table panel, [#8023](https://github.com/grafana/grafana/issues/8023)
+* **Dashboard**: If refresh is blocked due to tab not visible, then refresh when it becomes visible [#8076](https://github.com/grafana/grafana/issues/8076) thanks [@SimenB](https://github.com/SimenB)
 
 # 4.2.0 (2017-03-22)
 ## Minor Enhancements