Add igbinary link.

Andrei Zmievski · Andrei Zmievski · commit 344486a20ffe · 2009-02-13T13:04:33.000-08:00
diff --git a/README.markdown b/README.markdown
@@ -11,3 +11,4 @@ Resources
 ---------
  * [libmemcached](http://tangent.org/552/libmemcached.html)
  * [memcached](http://www.danga.com/memcached/)
+ * [igbinary](http://opensource.dynamoid.com/)
