README.txt documentation

The README.txt says to store AWS credentials in the $config array, but then in the example stores them in the $settings array:

...
* With the code installation complete, you must now configure s3fs to use
your Amazon Web Services credentials. To do so, store them in the $config
array in your site's settings.php file (sites/default/settings.php), like
so:
$settings['s3fs.access_key'] = 'YOUR ACCESS KEY';
$settings['s3fs.secret_key'] = 'YOUR SECRET KEY';
...