message: ENH: document Umpire integration changes
  Document Umpire integration with Axom's centralized memory management
  functions in release notes.
diff: @@ -10,6 +10,9 @@ The Axom project release numbers follow [Semantic Versioning](http://semver.org/
  ## [Unreleased] - Release date yyyy-mm-dd
  ### Added
  +- Centralized Axom's memory management functions in a seperate header and extended them to support
  + different memory spaces through Umpire. The caller may now specify the desired memory space by
  + an optional argument or set a different default memory space to use.
  - Added the ability to point Axom to an UMPIRE build by specifying UMPIRE_DIR either in
  a host-config or at the command line. Axom components can link to Umpire, by specifying
  "umpire" as a dependency. A simple umpire smoke test is also added for regression testing.
  