Excuse me if this is the wrong way to go about this, but I noticed a recipe is dead and I've gone about to write up a fix for it. It's just that the keep only tags bit needed to be changed up. It should be this now which gets it to work.
keep_only_tags = [dict(attrs=['article-content', 'heading'])]
I see people adding recipes as attachments or just posting the github link it's referring to, and I wasn't sure which to go about or if I should just do a pull request on github directly. Anyways, I hope this helps, and thanks for all you do.
https://github.com/kovidgoyal/calibr...reading.recipe