Update pysimpleguiqt to 0.31.0

Created by: pyup-bot

This PR updates PySimpleGUIQt from 0.28.0 to 0.31.0.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/pysimpleguiqt
• Repo: https://github.com/MikeTheWatchGuy/PySimpleGUI