fix URL for Andreas Happe's wicked_pdf post

README.md

@@ -220,7 +220,7 @@ You can put your default configuration, applied to all pdf's at "wicked_pdf.rb"
 
 ### Further Reading
 
-Andreas Happe's post [Generating PDFs from Ruby on Rails](http://starseeders.net/generating-pdfs-from-ruby-on-rails/)
+Andreas Happe's post [Generating PDFs from Ruby on Rails](http://snikt.net/rails/2012/04/26/wicked-pdf/)
 
 StackOverflow [questions with the tag "wicked-pdf"](http://stackoverflow.com/questions/tagged/wicked-pdf)