Python 3.8 Compatibility

[rmorshea]

Python 3.8 is out and is being widely adopted by the scientific community. See NEP-29 for Numpy's recommend Python and Numpy version support, which is used by other large projects like IPython and Jupyter.

[Stewori]

Luckily, this is much the same as Python 3.7 support #40 . It looks like once 3.7 is achieved, 3.8 works as well. It would be so great if the same was true for 3.9 and I hope it is. So far I did not find the time to check.

So, I will handle this issue practically as a duplicate of #40 . We can leave it open until #40 is fixed -- just for the record. I recommend to refer to #40 for further info and discussion.