Update CHANGELOG.md

Author: keveleigh

org.mixedrealitytoolkit.input/CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 * Added a project validation rule to ensure the Unity XR Hands subsystem is enabled in the OpenXR settings when the corresponding MRTK subsystem is enabled. [PR #973](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/973)
 * Added support for Unity's com.unity.cloud.gltfast and com.unity.cloud.ktx packages when loading controller models. [PR #631](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/631)
 * Added toggle for frame rate independent smoothing in camera simulation. [PR #1011](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1011)
+* Added partial polyfill logic for one of "select" and "select value" being mapped while the other isn't, instead of fully polyfilling based on hand joint data when either is missing. [PR #1041](https://github.com/MixedRealityToolkit/MixedRealityToolkit-Unity/pull/1041)
 
 ### Fixed