message: Update RELEASE_NOTES for 1.9.13
diff: @@ -5,8 +5,15 @@ A new header is inserted each time a *tag* is created.
  ## Next release (main branch)
  +## v1.9.14
  +
  ## v1.9.13
  +- Android: fix "No implementation found" error.
  +- Android: fix compilation error in UbershaderLoader.
  +- engine: computeDataSize now returns correct value for USHORT_565.
  +- Vulkan: various internal improvements.
  +
  ## v1.9.12
  - engine: Fixed GL errors seen with MSAA on WebGL.
  