[COPYING] Update
diff --git a/COPYING b/COPYING
index 48d1b30..162945e 100644
--- a/COPYING
+++ b/COPYING
@@ -11,10 +11,12 @@
Copyright © 2009 Keith Stribley
Copyright © 2009 Martin Hosken and SIL International
Copyright © 2007 Chris Wilson
-Copyright © 2005,2006,2020,2021 Behdad Esfahbod
+Copyright © 2005,2006,2020,2021,2022,2023 Behdad Esfahbod
Copyright © 2005 David Turner
Copyright © 2004,2007,2008,2009,2010 Red Hat, Inc.
Copyright © 1998-2004 David Turner and Werner Lemberg
+Copyright © 2022 Matthias Clasen
+Copyright © 2018,2021 Khaled Hosny
For full copyright notices consult the individual files in the package.