v0.60 - 132 readers - 30k words

Hi, here is version v0.60.

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

Thanks for being a reader and for the feedback provided

Dinis