message: Copyright year fix
  This is an extract of the relevant bit from
  commit of Bitcoin Core.
diff: -// Copyright (c) 2009-2015 The Bitcoin Core developers
  +// Copyright (c) 2009-2016 The Bitcoin Core developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  