I'm David Maxwell, one of the authors of Tango with Django. We've been working incredibly hard for the past two months or so heavily revising our Tango with Django book to work with Django 2.0, 2.1 and 2.2. Happy to say that it's just been completed! We have also worked very hard on tidying up the narrative -- the book flows much better, it reads better, and everything is now up to date!
For those of you who are interested, we've published it on Leanpub, and we've actually got a special discounted coupon for the first 50 people who would like to get a copy. You can get a discounted copy at https://leanpub.com/tangowithdjango2/c/pnias5Fe1gl9 -- first come, first serve!
Wishing you all the very best!