Update CHANGELOG.md

Add 3.3 release notes.

CHANGELOG.md

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+# Version 3.3
+
+## New Features:
+- Support for Fog and Heterogenous Volume rendering has been added to the RPR Full mode.  Simulated volumes are now rendered on CPU and GPU.
+- An option of exporting DeepEXR files for compositing has been added.  DeepEXR files contain multiple depth samples, allowing compositing better with depth.
+- Support for the Voronoi Texture node has been added.
+
+## Fixes:
+- The texture cache location is now saved between sessions.
+- Scenes that have many instances could crash IPR — fixed.
+- A crash could happen with a correct HDRI image on an environment light — fixed.
+- Support for Object ID and Random Color lookups in shader nodes has been added.
+- After a critical render error, users could not render again without restarting Maya — fixed.
+- Optimizations to the export of objects with deformation motion blur have been made.
+- An error with references to materials in another scene has been fixed.
+- The Albedo AOV now passes the “Base color” on the Toon shader.
+- A halo no longer appears around shadow and reflection catcher objects.
+- AOVs passed through transparent or refractive materials — fixed.
+- Better noise convergence with emissive materials using textures has been achieved.
+- Performance with outline rendering has been improved.
+- Performance degradation on WX7100 GPUs has been eliminated.
+- The Object ID Lookup node now works in the Full mode.
+- Objects with Toon shaders attached now cast shadows correctly if the flag is disabled.
+- An issue detected on the latest NVidia drivers has been fixed.
+
+## Known Issues:
+- Volumes are not implemented on macOS.
+- Vega GPUs with AMD 21.10 drivers can cause an issue when using the ML Denoiser.
+
+
 # Version 3.2
 
 ## New Features: