Update CHANGELOG.md

Author: Rello

CHANGELOG.md

@@ -11,7 +11,7 @@
 
 ### Changed
 - Allow thresholds on any column #474
-- **Attention**: existing thresholds are affected. See change #474 for details
+- **Attention**: existing thresholds are affected. See change [here](https://github.com/Rello/analytics/pull/474) for details
 - API v4 for will add %currentDate% as Y-m-d - see wiki
 - Change HTML grabber datasource to curl
 - Highlight selected report in panorama modal #484