No cStringIO in Python 3

[Bellaby]

I've chosen this as it seems to be the most promising out of a list of chart modules for Django. However I've run into a couple of issues trying to run it in DJango 2.2.3 with Python 3.7.4

I've commented on an issue opened in Mar last year which didn't seem to get attention and I've also come across this:

ModuleNotFoundError: No module named 'cStringIO'

It looks like cStringIO is not in Python 3 and is now io.StringIO or io.BytesIO

[rhblind]

Hello! You're right, this library has not been updated for several years and I'm a bit amazed that anyone still uses it, hehe :)

If you'd be willing to submit a PR with fixes, I'd be happy to push a new release, but I don't really have any spare time to be working on this myself these days.

[Bellaby]

I'll see what I can do. However I too don't have much spare time :) I'll let you know.