Bump version to 1.4.0

Author: ldionne

include/boost/hana/version.hpp

@@ -24,7 +24,7 @@ Distributed under the Boost Software License, Version 1.0.
 
 //! @ingroup group-config
 //! Macro expanding to the minor version of the library, i.e. the `y` in `x.y.z`.
-#define BOOST_HANA_MINOR_VERSION 3
+#define BOOST_HANA_MINOR_VERSION 4
 
 //! @ingroup group-config
 //! Macro expanding to the patch level of the library, i.e. the `z` in `x.y.z`.