kaleido deadlocks on windows

[s-banach]

I'm calling plotly.io.to_image() with kaleido backend.
It used to work with an old version, now it deadlocks.

[s-banach]

Okay it has just been broken for years and nobody cares
#110

[gvwilson]

Thanks for your interest in Kaleido. We are currently working on an overhaul that might address your issue - we hope to have news in a few weeks and will post an update then. Thanks - @gvwilson