message: Update RELEASE_NOTES for 1.9.8
diff: @@ -5,8 +5,20 @@ A new header is inserted each time a *tag* is created.
  ## Next release (main branch)
  +## v1.9.9
  +
  ## v1.9.8
  +- Fix a few Fence-related bugs
  +- gltfio: add createInstance() to AssetLoader.
  +- gltfio: fix ASAN issue when consuming invalid animation.
  +- gltfio: do not segfault on invalid primitives.
  +- gltfio: add safety checks to getAnimator.
  +- gltfio: fix segfault when consuming invalid file.
  +- Vulkan: various internal refactoring and improvements
  +- mathio: add ostream operator for quaternions.
  +- Fix color grading not applied when dithering is off.
  +
  ## v1.9.7
  - Vulkan: improvements to the ReadPixels implementation.
  