Revert Github API v3 URL as this library still uses v2

Author: polothy

lib/Github/HttpClient.php

@@ -14,7 +14,7 @@ abstract class Github_HttpClient implements Github_HttpClientInterface
      */
     protected $options = array(
         'protocol'   => 'https',
-        'url'        => ':protocol://api.github.com/:path',
+        'url'        => ':protocol://github.com/api/v2/:format/:path',
         'format'     => 'json',
         'user_agent' => 'php-github-api (http://github.com/ornicar/php-github-api)',
         'http_port'  => 443,