Maintenance status, deprecation warnings, Publishing as PyPi package

[timoleistner]

Hi and thank you for this awesome plotting functions.
Is this still planned to be published as a package?
I've tried to use the function outside the provided environment and noticed, that some Altair function names are deprecated now and some other quirks which made the plot not work immediately.
I've corrected these things and could create a pull request for the UpSetAltair() function, but other things would have to be updated to like the environment.yml, and I am not sure if this package is not abandoned.

I've also noticed that having a dot in any of the sets labels leads to them not being able to be plotted.