updated url for just enough ruby to get by book

free-programming-books.md

@@ -1578,7 +1578,7 @@ See also [TeX](#tex)
 * [CodeCademy Ruby](http://www.codecademy.com/tracks/ruby)
 * [Developing Games With Ruby](https://leanpub.com/developing-games-with-ruby/read)
 * [I Love Ruby](http://goo.gl/1qrMUN)
-* [Just Enough Ruby to Get By](http://dmtri.com/posts/65)
+* [Just Enough Ruby to Get By](http://jasonkim.ca/projects/just_enough_ruby_to_get_by)
 * [Learn Ruby the hard way](http://ruby.learncodethehardway.org/book/)
 * [Learn to Program, by Chris Pine](http://pine.fm/LearnToProgram/)
 * [Mr. Neighborly's Humble Little Ruby Book](http://www.humblelittlerubybook.com/)