Update CHANGELOG

Author: ajanikow

CHANGELOG.md

@@ -1,6 +1,8 @@
 # Change Log
 
 ## [master](https://github.com/arangodb/kube-arangodb/tree/master) (N/A)
+
+## [1.3.1](https://github.com/arangodb/kube-arangodb/tree/1.3.1) (2025-10-07)
 - (Documentation) Add ArangoPlatformStorage Docs & Examples
 - (Feature) Enable ML Operator and add required Platform Roles
 - (Feature) Helm Lint