Merge pull request #604 from rodrigo-medeiros/master

Added three books to the to the 'Professional Development' list.

free-programming-books.md

@@ -410,6 +410,9 @@
 * [Confessions of an IT Manager](http://download.red-gate.com/ebooks/DotNet/Confessions_IT_Manager.zip) *(RedGate, By Phil Factor)*
 * [Don't Just Roll the Dice](http://download.red-gate.com/ebooks/DJRTD_eBook.pdf) (PDF) *(RedGate, By Neil Davidson)*
 * [How to be a Programmer: A Short, Comprehensive, and Personal Summary](http://samizdat.mines.edu/howto/HowToBeAProgrammer.html) by Robert L. Read
+* [How to Do What You Love & Earn What You’re Worth as a Programmer](https://leanpub.com/dowhatyoulove/read) *(Leanpub, By Reginald Braithwaite)*
+* [What I've Learned From Failure](https://leanpub.com/shippingsoftware/read) *(Leanpub, By Reginald Braithwaite)*
+* [Why programmers work at night](https://leanpub.com/nightowls/read) *(Leanpub, By Swizec Teller)*
 
 ####Programming Paradigms
 * [Introduction to Functional Programming](http://www.cl.cam.ac.uk/teaching/Lectures/funprog-jrh-1996/) (class lectures and slides)