Just published new version of "Generation Z Developers" book (v0.60)

I've been working on a new book called "Generation Z Developers" and I really would like your feedback (you can get it for free from Leanpub at https://leanpub.com/generation-z)

In this version:

 - Content fixes and contributions by: Mike Eriksson, Michael Chadwick and Claudio Camerino
 - New book cover
 - New chapters:
    - DOT Language
    - AST (Abstract Syntax Tree)
    - Being criticized is an privilege

Here is the diff with the previous version: v0.50...v0.60]