Updating link to the advent tutorial

lib/Catmandu/Introduction.pod

@@ -93,7 +93,7 @@ For more information read our L<documentation pages|http://librecat.org/Catmandu
 
 In the winter of 2014 an Advent calendar tutorial was created to provide a day by day introduction into the UNIX command line and Catmandu:
 
-L<https://librecatproject.wordpress.com/2014/12/01/day-1-getting-catmandu/>
+L<https://librecatproject.wordpress.com/2014/12/08/day-6-introduction-into-catmandu/>
 
 If you need extra training, our developers regulary host workshops at library conferences and events: L<http://librecat.org/events.html>