Hook into the plugin update process of WordPress part III

function auv_plugin_api( $false, $action, $arg ){
    if (isset($arg->slug) && $arg->slug === plugin_basename( __FILE__ ) ) {
        $request = wp_remote_get( 'http://websupporter.net/current-version.php' );
        if (!is_wp_error( $request ) || wp_remote_retrieve_response_code( $request ) === 200 ) {
            return unserialize( $request['body'] );
        }
        return false;

    }
}
add_filter( 'plugins_api', 'auv_plugin_api', 10, 3 );