message: Update BTG license year 2019
  ### Fix license of use,
  update 2019;
  Format ISO 8869-1;
  in Memoriam Guto Schiavon
  ![guto-schiavon_bitcoin](https://user-images.githubusercontent.com/7637553/50562143-a7506f80-0cf8-11e9-9e58-bed4565c4715.jpg)
  R.I.P pioneer and friend.
  #ripGUTO
diff: The MIT License (MIT)
  Copyright (c) 2009-2017 The Bitcoin Core developers
  -Copyright (c) 2017-2018 The Bitcoin Gold developers
  +Copyright (c) 2017-2019 The Bitcoin Gold developers
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  