Update CHANGELOG

Author: ManifoldFR

CHANGELOG.md

@@ -6,6 +6,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Changed
+- Formatted all CMake listfiles using gersemi, add gersemi to pre-commit configuration ([#657](https://github.com/coal-library/coal/pull/657/files))
+
 ## [3.0.1] - 2025-02-12
 
 ### Fixed