message: Update COPYRIGHT_YEAR in clientversion.h to 2019
  Update COPYRIGHT_YEAR in clientversion.h to 2019
diff: // Copyright (c) 2009-2015 The Bitcoin Core developers
  -// Copyright (c) 2015-2018 The Bitcoin Unlimited developers
  +// Copyright (c) 2015-2019 The Bitcoin Unlimited developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  * Copyright year (2009-this)
  * Todo: update this when changing our copyright comments in the source
  */
  -#define COPYRIGHT_YEAR 2018
  +#define COPYRIGHT_YEAR 2019
  #endif // HAVE_CONFIG_H
  