message: Fix for license not being valid
  This has to be included to not violate the license.
  Ref:
diff: The MIT License (MIT)
  Copyright (c) 2009 Satoshi Nakamoto
  +Copyright (c) 2009-2016 Bitcoin Developers
  Copyright (c) 2009-2016 The Bitcoin Core developers
  -Copyright (c) 2015-2017 The Bitcoin Unlimited developers
  +Copyright (c) 2015-2019 The Bitcoin Unlimited developers
  Permission is hereby granted, free of charge, to any person obtaining a copy
  