README: fix link for getting xmllint and xsltproc

Fixes jquerygh-668
Closes jquerygh-676

Author: arthurvr

README.md

@@ -9,7 +9,7 @@ To build and deploy your changes for previewing in a [`jquery-wp-content`](https
 * [libxml2](http://xmlsoft.org/)
 * [libxslt](http://xmlsoft.org/libxslt/)
 
-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">zlatkovic.com</a>.
 
 ## Style Guidelines