Update copyright year

Reviewed-by: Richard Levitte <levitte@openssl.org>
diff --git a/test/tls13ccstest.c b/test/tls13ccstest.c
index db9bfe5..c95010f 100644
--- a/test/tls13ccstest.c
+++ b/test/tls13ccstest.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2017-2018 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