change log fmt

Author: curiecrypt

mithril-stm/CHANGELOG.md

@@ -7,8 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## 0.3.40 (18-03-2025)
 
-- Implementation blocks have been moved under their respective structures.
-- Property tests have been re-ordered. 
+### Changed
+
+- Moved implementation blocks under their respective structures.
+- Ordered property tests. 
 
 ## 0.3.18 (11-04-2024)