Fix "Rails 3 Way" url (fixes #60)

README.md

@@ -1562,7 +1562,7 @@ Here is a sample spec of a [carrierwave](https://github.com/jnicklas/carrierwave
 There are a few excellent resources on Rails style, that you should
 consider if you have time to spare:
 
-* [The Rails 3 Way](http://tr3w.com/)
+* [The Rails 3 Way](http://www.amazon.com/Rails-Way-Addison-Wesley-Professional-Ruby/dp/0321601661)
 * [Ruby on Rails Guides](http://guides.rubyonrails.org/)
 * [The RSpec Book](http://pragprog.com/book/achbd/the-rspec-book)
 * [The Cucumber Book](http://pragprog.com/book/hwcuc/the-cucumber-book)