Changelog update

Author: Chman

CHANGELOG.md

@@ -8,9 +8,12 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ### Fixed
 - On large scenes, the first object you'd add to a profile could throw a `NullReferenceException`. ([#530](https://github.com/Unity-Technologies/PostProcessing/pull/530))
+- Dithering now works correctly in dark areas when working in Gamma mode.
+- Colored grain wasn't colored when `POSTFX_DEBUG_STATIC_GRAIN` was set.
 
 ### Changed
 - Minor scripting API improvements. ([#530](https://github.com/Unity-Technologies/PostProcessing/pull/530))
+- More implicit casts for `VectorXParameter` and `ColorParameter` to `Vector2`, `Vector3` and `Vector4`.
 - Script-instantiated profiles in volumes are now properly supported in the inspector. ([#530](https://github.com/Unity-Technologies/PostProcessing/pull/530))
 
 ## [2.0.5-preview]