Added "Learn REBOL"

free-programming-books.md

@@ -109,6 +109,7 @@
     * [Flask](#flask)
 * [R](#r)
 * [Racket](#racket)
+* [REBOL](#rebol)
 * [Ruby](#ruby)
     * [RSpec](#rspec)
     * [Sinatra](#sinatra)
@@ -1188,6 +1189,10 @@ See also [TeX](#tex)
 * [The Racket Guide](http://docs.racket-lang.org/guide/index.html)
 
 
+###REBOL
+* [Learn REBOL](http://www.lulu.com/shop/nick-antonaccio/learn-rebol/ebook/product-17383182.html) - Nick Antonaccio
+
+
 ###Ruby
 * [The Bastards Book of Ruby](http://ruby.bastardsbook.com/)
 * [Learn Ruby the hard way](http://ruby.learncodethehardway.org/book/)