message: Add to PR release instructions
diff: @@ -58,6 +58,12 @@ release changes can be reviewed. Such changes include:
  release version number and release date in the heading, as well as,
  the corresponding link to the version on Github.
  +#. Update the mail map in ``axom/.mailmap`` by adding the names and emails
  + of new contributors since the last release.
  +
  +#. Update the citations in ``axom/CITATION.cff`` by adding the names
  + of new LLNL contributors since the last release.
  +
  #. Test the code by running it through all continuous integration tests
  and builds. This will ensure that all build configurations are working
  properly and all tests pass.
  