[CMake] Test cmake target on travis

test/cmake/main.cpp

@@ -0,0 +1,7 @@
+// Copyright 2018 Mike Dev
+// 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
+
+#include <boost/config.hpp>
+
+int main() {}