Update copyright year

Author: matej

MBProgressHUD.h

@@ -6,7 +6,7 @@
 
 // This code is distributed under the terms and conditions of the MIT license.
 
-// Copyright © 2009-2016 Matej Bukovinski
+// Copyright © 2009-2020 Matej Bukovinski
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal