Update pysimplegui to 4.18.2

Created by: pyup-bot

This PR updates PySimpleGUI from 4.16.0 to 4.18.2.

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

Links

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