chore: update changelog

Author: Nick MacCarthy

CHANGELOG.md

@@ -6,6 +6,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [3.0.3] - 2024-09-12
+Please use 3.0.3 going forward!   3.0.2 has a breaking bug.
+
 ### fixed
 - Fix: issue where version wasnt getting populated
 - Fix: move version out of `VERSION.txt` and into `datemath/_version.py` directly