update changelog

Author: franco-zalamena-iterable

CHANGELOG.md

@@ -2,6 +2,9 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## Unreleased
+- Replaced the deprecated `AsyncTask`-based push notification handling with `WorkManager` for improved reliability and compatibility with modern Android versions. No action is required.
+
 ## [3.6.5]
 ### Fixed
 - Fixed IterableEmbeddedView not having an empty constructor and causing crashes