update Changes.md for #12099

CHANGES.md

@@ -1,5 +1,13 @@
 # Change Log
 
+### 1.121 - 2024-09-01
+
+#### @cesium/engine
+
+##### Additions :tada:
+
+- Made the `time` parameter optional for `Property`, using `JulianDate.now()` as default. [#12099](https://github.com/CesiumGS/cesium/pull/12099)
+
 ### 1.120 - 2024-08-01
 
 #### @cesium/engine
@@ -9,7 +17,6 @@
 - Added `Transforms.computeIcrfToMoonFixedMatrix` and `Transforms.computeMoonFixedToIcrfMatrix` to compute the transformations between the Moon's fixed frame and ICRF at a given time.
 - Added `Transforms.computeIcrfToCentralBodyFixedMatrix` to specific the default ICRF to fixed frame transformation to use internally, including for lighting calculations.
 - Added SplitDirection property for display PointPrimitive and Billboard relative to the `Scene.splitPosition`. [#11982](https://github.com/CesiumGS/cesium/pull/11982)
-- Made the `time` parameter optional for `Property`, using `JulianDate.now()` as default. [#12099](https://github.com/CesiumGS/cesium/pull/12099)
 
 ##### Fixes :wrench: