Added a FutureWarning for constructs that will change semantically in
the future.  Changed PEP 237 hex constant warnings from
DeprecationWarning to FutureWarning.  Updated the documentation.
diff --git a/Include/pyerrors.h b/Include/pyerrors.h
index a3d9c5d..b783b7b 100644
--- a/Include/pyerrors.h
+++ b/Include/pyerrors.h
@@ -70,6 +70,7 @@
 PyAPI_DATA(PyObject *) PyExc_SyntaxWarning;
 PyAPI_DATA(PyObject *) PyExc_OverflowWarning;
 PyAPI_DATA(PyObject *) PyExc_RuntimeWarning;
+PyAPI_DATA(PyObject *) PyExc_FutureWarning;
 
 
 /* Convenience functions */