Org version

[mankoff]

I enjoyed reading this book. I read the Revision History and would like to suggest Org Mode as the next version. It supports exporting to AsciiDoc, LaTeX (PDF), HTML, etc. It renders well on GitHub. It also is an interactive format if people want, and supports (optionally) export to Jupyter (as requested by #104, #107, and presumably others).

This book is 10 years old - I suggest Org will still be around in 10 years, but many other formats may not exist in another 10 years.