Change to varnish_http_purge_headers filter

Hi,
would be useful to pass also $url info to the filter (varnish-http-purge/varnish-http-purge.php: 447):

$headers = apply_filters( ‘varnish_http_purge_headers’, array( ‘host’ => $host_headers, ‘X-Purge-Method’ => $x_purge_method ), $url );

Simone.