Updating CHANGELOG

Author: Aaron Eline

cedar-policy/CHANGELOG.md

@@ -48,6 +48,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Action entities in the store will pass schema-based validation without requiring
   the transitive closure to be pre-computed. (#581, resolving #285)
+- Policies containing the literal `i64::MIN` can now be properly converted to JSON ESTs (#601, resolving #596)
 
 ## [3.0.1] - 2023-12-21
 Cedar Language Version: 3.0.0