updated boost on windows

winx64/include/boost/histogram/axis.hpp

@@ -0,0 +1,16 @@
+// Copyright 2018 Hans Dembinski
+//
+// 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)
+
+#ifndef BOOST_HISTOGRAM_AXIS_HPP
+#define BOOST_HISTOGRAM_AXIS_HPP
+
+#include <boost/histogram/axis/category.hpp>
+#include <boost/histogram/axis/integer.hpp>
+#include <boost/histogram/axis/regular.hpp>
+#include <boost/histogram/axis/variable.hpp>
+#include <boost/histogram/axis/variant.hpp>
+
+#endif