Add the getHash() method.
Welcome to Hoa\File\Watcher \o/.

A naive file system watcher that fires three events: new, move and
modify. Example:

    $watcher = new Hoa\File\Watcher();
    $watcher->in('hoa://Library/File')
            ->name('#\.php$#')
            ->on('modify', function ( Hoa\Core\Event\Bucket $bucket ) {

                echo $bucket->getData['file'],
                     ' has been modified!', "\n";
            })
            ->run();