How to read the response effective URL in Guzzle ~6.0

Guzzle 6.1 solution right from the docs.

use GuzzleHttp\Client;
use GuzzleHttp\TransferStats;

$client = new Client;

$client->get('http://some.site.com', [
    'query'   => ['get' => 'params'],
    'on_stats' => function (TransferStats $stats) use (&$url) {
        $url = $stats->getEffectiveUri();
    }
])->getBody()->getContents();

echo $url; // http://some.site.com?get=params