message: DOC: document umpire TPL update in release notes
diff: @@ -22,6 +22,8 @@ The Axom project release numbers follow [Semantic Versioning](http://semver.org/
  ### Deprecated
  ### Changed
  +- Updated Umpire TPL to v2.0.0, which, natively handles zero byte re-allocations consistently. Workaround
  + for older releases of Umpire is in place for backwards compatibility.
  - Updated BLT to develop (f0ab9a4) as of Jan 15, 2020
  - Set CUDA_SEPARABLE_COMPILATION globally instead of just in a few components.
  - Reduced verbosity of quest's InOutOctree in cases where query point lies on surface.
  