Added link to primascan website.

unsupported/primax-colorado-2400u.html

@@ -35,7 +35,9 @@
     </p>
     <h2>Comments</h2>
     <p>
-      Maybe it works with the <a href="http://viceo.orcon.net.nz/">viceo backend</a>?
+      Actually this scanner is now supported by the <a
+      href="http://www.geocities.com/trsh0101/index.html">external primascan
+      backend</a>.
     </p>
     <h2>Output of /proc/bus/usb/devices or sane-find-scanner -v -v</h2>
     <pre>