Add copyright year and entity to COPYING

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

COPYING

diff --git a/COPYING b/COPYING
index 9c5dd0f..77085e6 100644
--- a/COPYING
+++ b/COPYING
@@ -1,6 +1,6 @@
 The MIT-Zero License
 
-Copyright (c) <year> <copyright holders>
+Copyright (c) 2020 by the Linux Foundation
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal