keeping history make configurable for insert/delete/update operation in django-simple-history

[osmancuet09]

Currently, we can keep the history of insert/update/delete all these three operations of the Django Model class or a table. It would be great if we can keep trace only deletion operation or only update operation or only insert operation. In another way, it would be grateful if it is configurable to keep history for insert or history for update or history for deletion operation.