Update the copyright

vstinner · vstinner · commit 14c4ade30c05 · 2021-04-22T23:41:02.000+02:00
The COPYING file was copied from https://github.com/psf/pyperf/ without updating the copyright. Follow recommendations of the Linux Foundation: https://www.linuxfoundation.org/en/blog/copyright-notices-in-open-source-software-projects/
diff --git a/COPYING b/COPYING
@@ -1,5 +1,5 @@
 The MIT License (MIT)
-Copyright 2016, Red Hat, Inc. and Google Inc.
+Copyright Contributors to the pythoncapi_compat project.
 
 Permission is hereby granted, free of charge, to any person obtaining a
 copy of this software and associated documentation files (the
diff --git a/pythoncapi_compat.h b/pythoncapi_compat.h
@@ -2,6 +2,7 @@
 // versions.
 //
 // File distributed under the MIT license.
+// Copyright Contributors to the pythoncapi_compat project.
 //
 // Homepage:
 // https://github.com/pythoncapi/pythoncapi_compat
