message: Extending license range
diff: -Copyright (C) 2013-2017, Alexis Jacomy, Guillaume Plique http://sigmajs.org
  +Copyright (C) 2013-2020, Alexis Jacomy, Guillaume Plique http://sigmajs.org
  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
  to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
  