quick update

oser_backend/visits/views.py

@@ -209,9 +209,7 @@ class ParticipationsViewSet(mixins.CreateModelMixin,
             participation, data=request.data)
         serializer.is_valid(raise_exception=True)
         serializer.save()
-        return Response(
-            serializer.data,
-            status=status.HTTP_201_CREATED)
+        return Response(serializer.data, status=status.HTTP_201_CREATED)
 
 
 class PlaceViewSet(viewsets.ReadOnlyModelViewSet):