Update CHANGES.md

Author: kring

CHANGES.md

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 # Change Log
 
-### ? - ?
+### v2.2.0 - 2023-12-14
 
 ##### Breaking Changes :mega:
 
@@ -10,6 +10,8 @@
 
  - Added support for multiple Cesium ion servers by creating `CesiumIonServer` data assets.
 
+In addition to the above, this release updates [cesium-native](https://github.com/CesiumGS/cesium-native) from v0.30.0 to v0.31.0. See the [changelog](https://github.com/CesiumGS/cesium-native/blob/main/CHANGES.md) for a complete list of changes in cesium-native.
+
 ### v2.1.0 - 2023-12-01
 
 ##### Additions :tada: