[vector] Cleaned up

Author: cmastalli

include/eigenpy/std-vector.hpp

@@ -111,9 +111,6 @@ struct overload_base_get_item_for_std_vector
   static boost::python::object base_get_item_slice(
       boost::python::back_reference<Container&> container,
       boost::python::slice slice) {
-
-    namespace bp = boost::python;
-
     bp::list out;
     try {
       auto rng = slice.get_indices(container.get().begin(), container.get().end());