Add a advanced elixir book (#9123)

* Add a advanced elixir book

* Update free-programming-books-langs.md

books/free-programming-books-langs.md

@@ -686,8 +686,9 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [Elixir School](https://elixirschool.com) (HTML)
 * [Elixir Succinctly, Syncfusion](https://www.syncfusion.com/ebooks/elixir-succinctly) (PDF, Kindle) (email address requested, not required)
 * [Getting Started Guide](http://elixir-lang.org/getting-started/introduction.html) (HTML) [(PDF, MOBI, EPUB)](https://github.com/potatogopher/elixir-getting-started)
+* [Hands-on Elixir & OTP: Cryptocurrency trading bot](https://book.elixircryptobot.com) - Kamil Skowron (HTML)
 * [Joy of Elixir](https://joyofelixir.com) - Ryan Bigg (HTML) - [Source](https://github.com/radar/joyofelixir) (:construction: *in process*)
-* [Learning Elixir](http://learningelixir.joekain.com) - Joseph Kain Blog (HTML)
+* [Learning Elixir](http://learningelixir.joekain.com) - Joseph Kain Blog (HTML) (:construction: *in process*)
 * [Learning the Elixir Language](https://riptutorial.com/Download/elixir-language.pdf) - Compiled from StackOverflow Documentation (PDF)
 * [The Ultimate Guide To Elixir For Object-Oriented Programmers](http://www.binarywebpark.com/ultimate-guide-elixir-object-oriented-programmers) - Bruce Park (HTML)