message: DOC: document AXOM_USE_CUB option in release notes
diff: @@ -12,6 +12,8 @@ The Axom project release numbers follow [Semantic Versioning](http://semver.org/
  ### Added
  - Added support in Mint for reading and writing an unstructured mesh in the [SU2 Mesh file format].
  This includes support for both single and mixed cell type topology unstructured mesh types.
  +- Added a new option to enable/disable use of CUB, AXOM_USE_CUB, which is disabled by default. This
  + allows to disable CUB to circumvent issues encountered with the device linker.
  ### Removed
  