message: Update version number for release.
diff: *******************************************************************************
  -Axom: ................................, version 0.5.0
  +Axom: ................................, version 0.6.0
  Copyright (c) 2017-2021, Lawrence Livermore National Security, LLC.
  Produced at the Lawrence Livermore National Laboratory.
  @@ -18,11 +18,13 @@ OCEC-17-187
  The Axom development team is comprised of:
  -Rich Hornung (hornung1@llnl.gov)
  Arlie Capps (capps2@llnl.gov)
  Noah Elliott (elliott22@llnl.gov)
  +Josh Essman (essman1@llnl.gov)
  Brian Han (han12@llnl.gov)
  Cyrus Harrison (harrison37@llnl.gov)
  +Rich Hornung (hornung1@llnl.gov)
  +Esteban Pauli (pauli2@llnl.gov)
  Lee Taylor (taylor16@llnl.gov)
  Kenny Weiss (kweiss@llnl.gov)
  Chris White (white238@llnl.gov)
  