Build a new release for the book

[aaongr]

Hello,
A wonderful day for all of Us :)

I am reading your book and I would like to express my thanks for this wonderful resource. I am grateful to you :)

Can you please make a new release of the book?

There are two commits with changes since the last one (v1.0.0...master)

Thank you for all

With my warmest regards for all the World :)

[ACPK]

@agorneo @JoelQ - The book found at https://books.thoughtbot.com/assets/testing-rails.pdf is outdated.