Update README.md

Author: c4milo

README.md

@@ -11,7 +11,7 @@ It does not parse the following elements:
 * Comments
 
 This module uses node-expat which will require extra steps if you want to get it installed on Windows. Please
-refer to its [documentation](http://node-xmpp.org/doc/expat.html#installing-on-windows?). Also, please be aware of known issues installing node-expat on Windows: https://github.com/node-xmpp/node-expat/issues?utf8=✓&q=is%3Aissue+is%3Aopen+windows
+refer to its [documentation](https://github.com/astro/node-expat/blob/master/README.md#windows).
 
 ## Installation
 ```