LICENSE: Update copyright year.
The MIT License (MIT)
Copyright (c) 2013-2020 Damien P. George
-Copyright (c) 2014-2019 Paul Sokolovsky
+Copyright (c) 2014-2021 Paul Sokolovsky
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
