message: Update RELEASE_NOTES for 1.9.14
diff: @@ -5,8 +5,13 @@ A new header is inserted each time a *tag* is created.
  ## Next release (main branch)
  +## v1.9.15
  +
  ## v1.9.14
  +- Improve bloom/emissive with glTF files.
  +- Publicly expose Exposure API for gltfio.
  +
  ## v1.9.13
  - Android: fix "No implementation found" error.
  