message: updated CHANGES.md for both credit issues
diff: - Added `UCesiumBoundingVolumePoolComponent` and `UCesiumBoundingVolumeComponent` to track the occlusion state of prospective tiles before they are loaded. This allows tile loads to be avoided if they will be occluded anyways.
  - Added options in `ACesium3DTileset` to control occlusion culling and turn it off if necessary.
  +##### Fixes :wrench:
  +- Fixed credit images not appearing in UE5.
  +- Added `UPROPERTY` to the Credit Widget to prevent it from being deleted by the garbage collector.
  +
  ### v1.15.0 - 2022-07-01
  ##### Additions :tada:
  