Update CHANGELOG

Author: shepherd-l

OneSignalExample/Assets/OneSignal/CHANGELOG.md

@@ -5,6 +5,9 @@ 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).
 
 ## [Unreleased]
+### Changed
+- Updated included Android SDK to [4.8.5](https://github.com/OneSignal/OneSignal-Android-SDK/releases/tag/4.8.5)
+- Updated included iOS SDK to [3.12.4](https://github.com/OneSignal/OneSignal-iOS-SDK/releases/tag/3.12.4)
 ### Fixed
 - Fixed InstallEdm4uStep to work with UPM EDM4U installations