Remove trailing spaces to pass codacy

app/api/views.py

@@ -226,7 +226,7 @@ class AnnotationList(generics.ListCreateAPIView):
 
     def perform_create(self, serializer):
         serializer.save(document_id=self.kwargs['doc_id'], user=self.request.user)
-    
+
     def delete(self, request, *args, **kwargs):
         queryset = self.get_queryset()
         queryset.all().delete()