Update books/free-programming-books-langs.md

Co-authored-by: David Ordás <[email protected]>

Author: chauxvive

books/free-programming-books-langs.md

@@ -571,7 +571,7 @@ That section got so big, we decided to split it into its own file, the [BY SUBJE
 * [CoffeeScript Ristretto](https://leanpub.com/coffeescript-ristretto/read) - Reginald Braithwaite  *(Leanpub account or valid email requested)*
 * [Hard Rock CoffeeScript](https://alchaplinsky.github.io/hard-rock-coffeescript/)
 * [Smooth CoffeeScript](http://autotelicum.github.io/Smooth-CoffeeScript/SmoothCoffeeScript.html)
-* [The Little Book on CoffeeScript](http://arcturo.github.io/library/coffeescript/)
+* [The Little Book on CoffeeScript](http://arcturo.github.io/library/coffeescript/) - Alex Chaplinsky (gitbook)
 
 
 ### ColdFusion