// Copyright 2019 Dmitry Arkhipov
// Distributed under the Boost Software License, Version 1.0. (See
-// accompanying file LICENSE_1_0.txt or copy at
-// http://www.boost.org/LICENSE_1_0.txt)
+// accompanying file LICENSE.txt or copy at
+// https://www.bfgroup.xyz/b2/LICENSE.txt)
#include <string>