Update change log

Author: VladislavKostyukevich

CHANGELOG.md

@@ -3,7 +3,7 @@
 ## 0.3.8 (Unreleased)
 
 Features:
-  - [Doc] Update Swagger -> View Issue
+  - [Doc] Update Swagger with Statistic endpoints -> [View Issue](https://github.com/aquality-automation/aquality-tracking/issues/76)
 
 ## 0.3.7 (2020-03-02)