When activate the plugin with WP_DEBUG on. I get two deprecated notice. Please fix them and keep the plugin upto date.
Notice: add_option was called with an argument that is deprecated since version 2.3 with no alternative available. in /wp-includes/functions.php on line 2714
Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in /wp-includes/functions.php on line 2712
I tried disabling all plugins and enabling only your plugin. The notice still shows. And little confused because the it points to core file. Perhaps plugin developer better understand the issue.