Nice one Mafinar!! I’ve been meaning to learn Crystal for a while since it is so close to Ruby (so I think should be fairly easy to pick up) and a great time to now given it hit 1.0 last month 
I’m not sure when I will be able to jump into the book club myself as I want to finish Programming Erlang first, but will definitely be keeping an eye on this thread for you and anyone else who gets started first. If I get a minute I will post on the Crystal forums to ask if anyone else would like to join us too 
For those of you interested in Crystal, it would be great for you to join us - the more the merrier as they say! 