use more common path to env

extensionmirror.php

@@ -1,7 +1,7 @@
-#!/bin/env php
+#!/usr/bin/env php
 <?php
 
 require 'vendor/autoload.php';
 
 $cli = new \splitbrain\DokuWikiExtensionMirror\Downloader();
-$cli->run();
+$cli->run();