Update CHANGELOG.md

Author: LagueKristin

com.unity.template-hd/Packages/com.unity.template.hd/CHANGELOG.md

@@ -4,6 +4,14 @@ All notable changes to this project template will be documented in this file.
 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).
 
+## [16.0.8] - 2024-04-05
+
+### Changed
+
+- Upgrade input system version to 1.8.1
+- Set InputHandler to both
+- Create InputActions.asset
+
 ## [16.0.7] - 2024-02-13
 
 ### Changed