Add Egon Willighagen to copyright notices

Author: tarleb

LICENSE

@@ -1,6 +1,7 @@
 MIT License
 
-Copyright © 2017–2024 Albert Krewinkel and Robert Winkler
+Copyright © 2017–2022 Albert Krewinkel, Robert Winkler,
+          © 2023-2024 Albert Krewinkel, Egon Willighagen
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

_extensions/cito/cito.lua

@@ -1,4 +1,5 @@
--- Copyright © 2017–2024 Albert Krewinkel, Robert Winkler
+-- Copyright © 2017–2022 Albert Krewinkel, Robert Winkler,
+--+          © 2023-2024 Albert Krewinkel, Egon Willighagen
 --
 -- This library is free software; you can redistribute it and/or modify it
 -- under the terms of the MIT license. See LICENSE for details.