make_resources does not work with newer (5.14+) PySide2 versions

[dgovil]

So it looks like newer PySide2 versions (5.14+) have dropped support for the -py2 and -py3 flags.
I know the project's setup.py currently locks to 5.11 and in Maya, I assume you're trusting it's 5.12.

Maya 2021 will default to Qt 5.15 I believe, so I just wanted to create an issue to highlight that it might become a problem shortly. Perhaps mentioning a max Qt version in the docs for now would suffice. I'm not sure how they'll handle needing to support generation for py2 and py3 versions of resources though...

[ImLucasBrown]

Good catch, we'll look into this more.
We've had some trouble keeping up with all the PySide2 versions (especially in Maya 2018) and cross compatibility between Py2/3.