Add back copyright to license. (#1060)

Fixes #1059.

LICENSE

@@ -1,5 +1,7 @@
 The MIT License (MIT)
 
+Copyright (c) Renci, Oleg Kapeljushnik, Gert Driesen and contributors
+
 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