2019.1
The first official release, I know that a lot of people don't want to leave their email to download it.
So in this release you can find the generated version from Leanpub of those files.
There is also a web version https://leanpub.com/contributetoopensource-therightway/read_full
I suggest to you to take the book for free at https://leanpub.com/contributetoopensource-therightway/ so you will receive notifications (it is possible also on GitHub anyway).