Seth Merrick,

Simply add a ‘tested’ value to the $packages array, like so:

$packages['your-plugin'] = array(
       'versions' => array(
               'x.x' => array(
                       ...
                       'tested' => '3.1.1', // highest version of WP your plugin works with

And then, reflect that change in the ‘plugin_information’ check further down in the document:

if ($action == 'plugin_information') {
               $data = new stdClass;
               ...
               $data->tested = $latest_package['tested']; // pull in the value from $packages

That’s it. Worked for me anyway.

Good luck!