Update copyright year

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7668)
diff --git a/fuzz/helper.py b/fuzz/helper.py
index 889af30..e83ea00 100755
--- a/fuzz/helper.py
+++ b/fuzz/helper.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python
 #
-# Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+# Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
 #
 # Licensed under the OpenSSL license (the "License").  You may not use
 # this file except in compliance with the License.  You can obtain a copy