message: Fixed copyright years and add Alias developers
diff: -Copyright (c) 2016-2019 SpectreCoin Developers
  -Copyright (c) 2014-2015 ShadowCoin Developers
  +Copyright (c) 2020 Alias Developers
  +Copyright (c) 2016 SpectreCoin Developers
  +Copyright (c) 2014 ShadowCoin Developers
  Copyright (c) 2014 BlackCoin Developers
  -Copyright (c) 2013-2014 NovaCoin Developers
  -Copyright (c) 2011-2012 PPCoin Developers
  -Copyright (c) 2009-2014 Bitcoin Developers
  +Copyright (c) 2013 NovaCoin Developers
  +Copyright (c) 2011 PPCoin Developers
  +Copyright (c) 2009 Bitcoin 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
  