Bring Python into the next decade. (GH-17801)

(cherry picked from commit 946b29ea0b3b386ed05e87e60b8617c9dc19cd53)

Co-authored-by: Benjamin Peterson <benjamin@python.org>
diff --git a/Python/getcopyright.c b/Python/getcopyright.c
index 27a1731..299ccc0 100644
--- a/Python/getcopyright.c
+++ b/Python/getcopyright.c
@@ -4,7 +4,7 @@
 
 static const char cprt[] =
 "\
-Copyright (c) 2001-2019 Python Software Foundation.\n\
+Copyright (c) 2001-2020 Python Software Foundation.\n\
 All Rights Reserved.\n\
 \n\
 Copyright (c) 2000 BeOpen.com.\n\