updated readme to include a link to demo page

README.md

@@ -20,7 +20,9 @@ Access it at:
 http://your_server:60222/
 ```
 
-## Preview
+## Demo
+
+http://us1.proxynova.net:60222/
 
 ![](https://cdn.proxynova.com/github/vnstat.png)
 

vnstat.php

@@ -1,15 +1,14 @@
 <?php
 
 header("Content-Type: text/plain");
+header("X-Robots-Tag: noindex");
 
-exec("vnstat -w", $output, $return_var);
+//  Note that if the array already contains some elements, exec() will append to the end of the array.
+exec("vnstat -d", $output, $return_var);
 
 // http://tldp.org/LDP/abs/html/exitcodes.html
 if ($return_var == 127) {
     die("Error: vnstat not installed!");
 }
 
-//  Note that if the array already contains some elements, exec() will append to the end of the array.
-exec("vnstat -d", $output, $return_var);
-
 echo implode("\r\n", $output);