Merge pull request #158 from Cito/fix_utils_type_info

Fix a small problem in the TypeInfo utility class

Author: syrusakbary

graphql/utils/type_info.py

@@ -148,7 +148,7 @@ def leave_Argument(self):
         self._argument = None
         pop(self._input_type_stack)
 
-    def leave_ListType(self):
+    def leave_ListValue(self):
         pop(self._input_type_stack)
 
-    leave_ObjectField = leave_ListType
+    leave_ObjectField = leave_ListValue