Update Erlang in Anger Url (#2300)

* Update Erlang in Anger Url

* updated ebook link to website

free-programming-books.md

@@ -1027,7 +1027,7 @@
 * [Getting Started with Erlang User's Guide](http://www.erlang.org/doc/getting_started/users_guide.html) (HTML)
 * [Learn You Some Erlang For Great Good](http://learnyousomeerlang.com) - Frederic Trottier-Hebert
 * [Making reliable distributed systems in the presence of software errors](http://www.erlang.org/download/armstrong_thesis_2003.pdf) - Joe Armstrong (PDF)
-* [Stuff Goes Bad: Erlang in Anger](https://s3.amazonaws.com/erlang-in-anger/text.v1.0.3.pdf) - Fred Herbert (PDF)
+* [Stuff Goes Bad: Erlang in Anger](https://www.erlang-in-anger.com) - Fred Herbert (PDF)
 
 
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