some changes for python 3.10 as diff

[olisnr]

hi when i try to use this interesting module with python 3.10 there popup many error messages

the first is: `Exception has occurred: AttributeError module 'numpy' has no attribute 'float'.

its possible to change the float to float64, but then the next error comes. the function scipy.signal.step2() was replaced with step(). after import collections it seems to need a collections.Iterable = collections.abc.Iterable. the function gcd() is now in the module math instead of fractions and there are more problems i didnt found out by now.

thus my question: is deltasigma already ported to a more modern python version? and if Yes, where to find it? or should i try to fix all errors my self and somehow upload it (if im lucky)?