Update CHANGELOG.md

Author: Vectorial1024

CHANGELOG.md

@@ -3,6 +3,8 @@ Note: you may refer to `README.md` for description of features.
 
 ## Dev (WIP)
 - Task IDs can be given to tasks (generated or not) (https://github.com/Vectorial1024/laravel-process-async/issues/5)
+- Updated to use `opis/closure` 4.0 for task details serialization (https://github.com/Vectorial1024/laravel-process-async/issues/12)
+  - Technically a breaking internal change, but no code change expected and downtime is expected to be almost negligible
 
 ## 0.2.0 (2025-01-04)
 - Task runners are now detached from the task giver (https://github.com/Vectorial1024/laravel-process-async/issues/7)