Update cups-filters download link (#182)

The old link looks like an abandoned directory (e.g. it is missing the 1.28.17 release).

Author: gnoack

_projects/01-cups-filters.md

@@ -18,6 +18,6 @@ From CUPS 1.6.0 on, this package is required for using printer drivers with CUPS
    	<i class="fab fa-fw fa-github" aria-hidden="true"></i>GitHub
   	</a>
 
-* <a href="http://openprinting.org/download/cups-filters/" itemprop="sameAs" rel="nofollow noopener noreferrer">
+* <a href="https://github.com/OpenPrinting/cups-filters/releases" itemprop="sameAs" rel="nofollow noopener noreferrer">
 	<i class="fas fa-fw fa-link" aria-hidden="true"></i>Downloads
-	</a>
+	</a>