PySimpleGUI is no longer Open Source

[spyoungtech]

PySimpleGUI is no longer Open Source and its source code has been nuked from GitHub. It is now commercial software requiring a contractual license to use. Consider suggesting users use the free-forever fork, FreeSimpleGUI. This way, they won't be nagged/required to register their software or risk violating the proprietary/commercial license.

It's a drop-in replacement, so all that needs to be done is to replace the import:

- import PySimpleGUI as sg
+ import FreeSimpleGUI as sg