use correct parameter name for schema_name_resolver

hapic/doc.py

@@ -158,7 +158,7 @@ class DocGenerator(object):
                 'apispec.ext.bottle',
                 'apispec.ext.marshmallow',
             ),
-            schema_name_resolver_callable=generate_schema_name,
+            schema_name_resolver=generate_schema_name,
         )
 
         schemas = []