I have updated my book to the latest Lumberyard as of August2019: Lumberyard 1.20. There was no new content in this update aside from updating everything up to 1.20. Enjoy!
P.S. GitHub for the book is here: https://github.com/Aristo7/LYBook_1.20
P.P.S. If you buy a print copy, you get ebook for free but only on US markets :`(