Update copyright year

Reviewed-by: Nicola Tuveri <nic.tuv@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/13144)
diff --git a/test/lhash_test.c b/test/lhash_test.c
index a9aac5f..537ae18 100644
--- a/test/lhash_test.c
+++ b/test/lhash_test.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2017-2020 The OpenSSL Project Authors. All Rights Reserved.
  * Copyright (c) 2017, Oracle and/or its affiliates.  All rights reserved.
  *
  * Licensed under the Apache License 2.0 (the "License").  You may not use