URL that gives the latest stable version of CI

Yes, I know Composer will do...
But I've been just curious.

If created a piece of code to check how GitHub API works. In case someone was interested (a CLI script):

PHP Code:

<?php /* get_latest_version.php */

function url_get_contents($url)
{
 $ch = curl_init();
 $timeout = 5; /* seconds */
 $version = curl_version();
 curl_setopt ($ch, CURLOPT_URL, $url);
 curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
 curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt ($ch, CURLOPT_USERAGENT, 'cURL/'.$version['version']);
 $result = curl_exec($ch);
 curl_close($ch);
 return $result;
}

function tag_version_compare($tag1, $tag2)
{
 return version_compare($tag1['name'], $tag2['name']);
}

function get_latest_version_tag()
{
 $tags = json_decode(
   url_get_contents('https://api.github.com/repos/bcit-ci/CodeIgniter/tags'),
   true
 );

 if ($tags && empty($tags['message']))
 {
   usort($tags, 'tag_version_compare');
   return end($tags);
 }
 else
   return $tags;
}

$latest_tag = get_latest_version_tag();
if (isset($latest_tag['name']))
 echo $latest_tag['name'];
elseif (isset($latest_tag['message']))
 echo $latest_tag['message'];
else
{
 echo 'Cannot retrieve the latest version of CodeIgniter.';
 exit(1);
}