Bugfix setra client batch api search

setra was crashing because wrong parameters was used to search for batches

setra_client/client.py

@@ -298,8 +298,8 @@ class SetraClient(object):
         """
 
         params = {
-            'min_created_date': min_created_date,
-            'max_created_date': max_created_date,
+            'created__gte': min_created_date,
+            'created__lte': max_created_date,
             'batch_progress': batch_progress,
             'interface': interface,
         }