Readme: reference more up2date xsl* tools

refs jquery/api.jquery.com#71 and fixes "Error: Unknown option --path" xsltproc errors

Author: staabm

README.md

@@ -8,7 +8,7 @@ jqueryvalidation-content
 * <a href="http://www.xmlsoft.org/">libxml2</a>
 * <a href="http://xmlsoft.org/XSLT/">libxslt</a>
 
-The `xmllint` and `xsltproc` utilities need to be in your path. If you are on Windows, you can get libxml2 and libxslt from <a href="http://sourceforge.net/projects/gnuwin32/files/">GnuWin32</a>.
+The `xmllint` and `xsltproc` utilities need to be in your path. If you are on Windows, you can get libxml2 and libxslt from <a href="http://www.zlatkovic.com/libxml.en.html">GnuWin32</a>.
 
 * Install [WordPress](http://wordpress.org/download/)
 * Install [jqueryvalidation-theme](https://github.com/jzaefferer/validation-theme) - clone that repo, then symlink it into your `wp-content/themes` folder