Added uploads/medium/ for later versions

php/define.php

@@ -13,6 +13,7 @@ define('LYCHEE', substr(__DIR__, 0, -3));
 define('LYCHEE_DATA', LYCHEE . 'data/');
 define('LYCHEE_UPLOADS', LYCHEE . 'uploads/');
 define('LYCHEE_UPLOADS_BIG', LYCHEE_UPLOADS . 'big/');
+define('LYCHEE_UPLOADS_MEDIUM', LYCHEE_UPLOADS . 'medium/');
 define('LYCHEE_UPLOADS_THUMB', LYCHEE_UPLOADS . 'thumb/');
 define('LYCHEE_UPLOADS_IMPORT', LYCHEE_UPLOADS . 'import/');
 define('LYCHEE_PLUGINS', LYCHEE . 'plugins/');