Fix a potential fatal error when running update from a Cron Job.

Problem: The update script loads its dependencies using a relative path, so it may crash if you run it from a different directory. Fixed by using an absolute path instead.

Fixes #2

index.php

@@ -1,7 +1,7 @@
 <?php
 namespace Wpup;
 use PDO;
-require 'vendor/autoload.php';
+require __DIR__ . '/vendor/autoload.php';
 
 $db = new PDO("sqlite:" . __DIR__ . '/db/stats.db3');
 $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

update.php

@@ -1,5 +1,5 @@
 <?php
-require 'vendor/autoload.php';
+require __DIR__ . '/vendor/autoload.php';
 
 if (php_sapi_name() !== "cli") {
 	echo 'Error: This script must be run from the command line.';