message: Update RELEASE_NOTES for 1.9.9
diff: @@ -5,10 +5,19 @@ A new header is inserted each time a *tag* is created.
  ## Next release (main branch)
  +## v1.9.10
  +
  - Fix EXC_BAD_INSTRUCTION seen when using headless SwapChains on macOS with OpenGL.
  ## v1.9.9
  +- Vulkan: internal robustness improvements
  +- Metal: Support CVPixelBuffer SwapChains
  +- Metal: Support copyFrame
  +- Fix clear behavior with RenderTarget API.
  +- Fix GetRefractionMode JNI binding
  +- Additional fixes for Fence bug
  +
  ## v1.9.8
  - Fix a few Fence-related bugs
  