Maybe use newer fork

[leonhardklein]

Hi, I hope it is not inpolite to open a issue like this: It took me some time until I confirmed my python skills for updating outdated code are not as good as the fork in

https://github.com/hpretl/python-deltasigma

Since this repo seems to be quite dead, the fork may save other people some time - so I hope it is ok to highlight this in here. (there are other forks as well, but that one seemed to be the most advanced as today).

Best Regards, leo