Update version to 5.8.12

Author: bazooka07

core/lib/config.php

@@ -1,6 +1,6 @@
 <?php
 const PLX_DEBUG = true;
-const PLX_VERSION = '5.8.11';
+const PLX_VERSION = '5.8.12';
 const PLX_URL_REPO = 'https://www.pluxml.org';
 const PLX_URL_VERSION = PLX_URL_REPO.'/download/latest-version.txt';