consistent copyright statement format, update date

Author: paralax

README.md

@@ -21,7 +21,7 @@ We strive to make the OWASP ModSecurity CRS accessible to a wide audience of beg
 
 ## License
 
-Copyright 2006-2016 Trustwave and contributors.
+Copyright (c) 2006-2017 Trustwave and contributors. All rights reserved.
 
 The OWASP ModSecurity Core Rule Set is distributed under Apache Software License (ASL) version 2. Please see the enclosed LICENSE file for full details.