message: Updates mailmap file.
diff: @@ -22,15 +22,15 @@ Randolph Settgast <settgast1@llnl.gov> Randolph R. Settgast <settgast1@llnl
  Randolph Settgast <settgast1@llnl.gov> Randy Settgast <settgast1@llnl.gov>
  Richard D. Hornung <hornung1@llnl.gov> Rich Hornung <hornung1@llnl.gov>
  -Axom Shared User <axom-dev@llnl.gov> Richard D. Hornung <atk@cab687.llnl.gov>
  -Axom Shared User <axom-dev@llnl.gov> Asctoolkit Shared User <atk@cab668.llnl.gov>
  +Axom Shared User <axom-dev@llnl.gov> Asctoolkit Shared User <axom-dev@llnl.gov>
  Axom Shared User <axom-dev@llnl.gov> Asctoolkit Shared User <atk@cab687.llnl.gov>
  +Axom Shared User <axom-dev@llnl.gov> Asctoolkit Shared User <atk@cab668.llnl.gov>
  Axom Shared User <axom-dev@llnl.gov> Asctoolkit Shared User <atk@cab670.llnl.gov>
  -Axom Shared User <axom-dev@llnl.gov> Richard D. Hornung <atk@rzalastor2.llnl.gov>
  -Axom Shared User <axom-dev@llnl.gov> Aaron Black <atk@cab687.llnl.gov>
  Axom Shared User <axom-dev@llnl.gov> Asctoolkit Shared User <atk@vulcanlac4.llnl.gov>
  Axom Shared User <axom-dev@llnl.gov> Asctoolkit Shared User <atk@vulcanlac7.llnl.gov>
  -
  +Axom Shared User <axom-dev@llnl.gov> Aaron Black <atk@cab687.llnl.gov>
  +Axom Shared User <axom-dev@llnl.gov> Richard D. Hornung <atk@rzalastor2.llnl.gov>
  +Axom Shared User <axom-dev@llnl.gov> Richard D. Hornung <atk@cab687.llnl.gov>
  uncrustify-robot <axom-dev@llnl.gov> uncrustify-robot <asctoolkit-dev@llnl.gov>
  shroud-robot <axom-dev@llnl.gov> shroud-robot <asctoolkit-dev@llnl.gov>
  