Getting a twitter user's latest posts using API v1.1 and Guzzle (PHP)

{
    "require": {
        "guzzle/guzzle": "~3.1.1"
    }
}

$twitter_client = new \Guzzle\Http\Client('https://api.twitter.com/{version}', array(
    'version' => '1.1'
));
$twitter_client->addSubscriber(new \Guzzle\Plugin\Oauth\OauthPlugin(array(
    'consumer_key'  => TWITTER_CONSUMER_KEY,
    'consumer_secret' => TWITTER_CONSUMER_SECRET,
    'token'       => TWITTER_ACCESS_TOKEN,
    'token_secret'  => TWITTER_ACCESS_TOKEN_SECRET
)));

$request = $twitter_client->get('statuses/user_timeline.json');
$request->getQuery()->set('count', 5);
$request->getQuery()->set('screen_name', 'YOURUSERNAME');
$response = $request->send();

$tweets = json_decode($response->getBody());