message: Fixed license in checkpointsync.h
diff: // Copyright (c) 2012-2019 The Peercoin developers
  -// Distributed under conditional MIT open source software license
  -// see the accompanying file COPYING
  +// Distributed under the MIT software license, see the accompanying
  +// file COPYING or http://www.opensource.org/licenses/mit-license.php.
  #ifndef PEERCOIN_CHECKPOINTSYNC_H
  #define PEERCOIN_CHECKPOINTSYNC_H
  