Allow pathlib.Path instances as savefig values too

[mattsta]

Allowing figure targets to be pathlib.Path instances makes integration easier with libraries already providing Path instances (saves unnecessary str() conversion calls since Path instances work as output too)

[DanielGoldfarb]

Thanks. Good idea! I am assuming you have tested that this works as expected. I've just bumped the version number. Making sure each PR increases the version helps identify the code if someone reports an issue.

[mattsta]

Thanks!

I did test the workflow on my local install and it generated the same files as using string filenames. I assume the value is just being passed through as the open() parameter for writes, so usage is interchangeable with string or BytesIO

[DanielGoldfarb]

Thanks Matt.

Would it be any trouble for you to also contribute a pathlib.Path example to the savefig examples notebook, along with a short explanation of how and why one would want to use pathlib.Path with savefig?

All the best. --Daniel