chore: update CHANGELOG.md

Author: matkoch

CHANGELOG.md

@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [vNext]
+- Fixed `Options` serialization to JSON
+- Fixed `Options` for default members in interfaces
+- Fixed missing `ProcessExitHandler` setters
 
 ## [9.0.0] / 2024-11-21
 - Removed usages of `BinaryFormatter`