Update stable tag

Author: unfulvio

readme.txt

@@ -5,7 +5,7 @@ Tags: dev, development, bug, debug, debugging, stacktrace, php, console, termina
 Requires at least: 3.6.0
 Requires PHP: 5.6
 Tested up to: 5.2.1
-Stable tag: 1.5.5
+Stable tag: 1.6.0
 License: GPLv3 or later
 License URI: http://www.gnu.org/licenses/gpl-3.0.html