update Dart CHANGELOG

PiperOrigin-RevId: 529713579

Author: Material Eng

dart/CHANGELOG.md

@@ -1,10 +1,17 @@
 ## 0.5.0 - 2023-05-02
 ### Removed
-- Removed `inverseOnPrimary`, an unfounded dynamic color.
+- Removed `inverseOnPrimary`, an unfounded dynamic color
 
 ## 0.4.0 - 2023-04-28
 ### Added
 - Add `label` and `description` to each `Variant`
+- Add `xFixed` Material dynamic colors
+
+### Changed
+- Update monochrome scheme to new spec
+
+## Fixed
+- Fix `inverseSurface` tone value
 
 ## 0.3.0 - 2023-03-10
 ### Added