add qualified imports

README.md

@@ -263,4 +263,12 @@ prolog> :{{
 
 local_member(X, Xs) :- member(X, Xs).
 }}:
-```
+```
+`use_module` directives can be qualified by adding a list of imports:
+
+```
+prolog> :- use_module(library(lists), [member/2]).
+```
+
+A qualified `use_module` can be used to remove imports from the
+toplevel by giving it an empty import list.