The new version of the Hands-on Elixir & OTP book is now out 
This update includes:
- a new chapter that deep dives into using the mox package to create more reliable tests without dependencies
- readability improvements (new font used through the book + line spacing increased)
- many small improvements like a custom password for dockerized DB, version of dependencies limited to minor
The book is now 226 pages long 
- read online @ https://www.elixircryptobot.com
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