Fix to avoid fatal error

I was getting a fatal error from this plugin under certain conditions:

Fatal error: Uncaught Error: Class 'SeriouslySimpleStats\Classes\Stats' not found in ... wp-content/plugins/seriously-simple-stats/seriously-simple-stats.php:48

Changing line 30 in seriously-simple-stats.php to explicitly include the correct autoload.php file like this:
require_once __DIR__ . '/vendor/autoload.php';
seems to fix the issue for me. Can you make this update in the code for future releases?