Merge pull request #267 from johand/rbooks

Ruby books

free-programming-books-es.md

@@ -43,7 +43,6 @@
 
 ###Ruby
 
-* [Ruby en 20 minutos](https://www.ruby-lang.org/es/documentation/quickstart/)
 * [Guía para aprender a programar con Ruby. Adaptación al español del libro "Learn to Program" de Chris Pine](https://github.com/rubyperu/aprende.a.programar)
 * [Ruby en 20 minutos](https://www.ruby-lang.org/es/documentation/quickstart/)
 

free-programming-books.md

@@ -902,6 +902,8 @@ See also [TeX](#tex)
 * [Try Ruby](http://tryruby.org/)
 * [Ruby Koans](http://www.rubykoans.com/)
 * [Ruby User's Guide](http://www.rubyist.net/~slagell/ruby/)
+* [The Little Book Of Ruby](http://www.sapphiresteel.com/The-Little-Book-Of-Ruby)
+* [Mr. Neighborly's Humble Little Ruby Book](http://humblelittlerubybook.com/book/)
 
 
 ###Ruby on Rails