Merge pull request #221 from ktkaushik/master

adding Learn Haskell fast and hard

free-programming-books.md

@@ -513,6 +513,7 @@
 * [Haskell no panic](http://lisperati.com/haskell/)
 * [A Gentle Introduction to Haskell](http://www.haskell.org/tutorial/)
 * [Speeding Through Haskell](http://www.sthaskell.com/)
+* [Learn Haskell Fast and Hard](http://yannesposito.com/Scratch/en/blog/Haskell-the-Hard-Way)
 
 
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