[3.7] Bump copyright years to 2019. (GH-11406)

(cherry picked from commit 9a69ae8a78785105ded02b083b2e5cd2dd939307)
diff --git a/Python/getcopyright.c b/Python/getcopyright.c
index 51772ec..27a1731 100644
--- a/Python/getcopyright.c
+++ b/Python/getcopyright.c
@@ -4,7 +4,7 @@
 
 static const char cprt[] =
 "\
-Copyright (c) 2001-2018 Python Software Foundation.\n\
+Copyright (c) 2001-2019 Python Software Foundation.\n\
 All Rights Reserved.\n\
 \n\
 Copyright (c) 2000 BeOpen.com.\n\