How to consume a json Rest API with PHP using Guzzle

app.php

<?php
require __DIR__ . '/vendor/autoload.php';

use GuzzleHttp\Client;

$client = new Client([
    'base_uri' => 'https://api.github.com',
    'timeout'  => 5.0,
]);

$response = $client->get('/repos/twilio/twilio-php/contributors');
$body = json_decode($response->getBody());
print_r($body);

composer.json

{
   "require": {
      "guzzlehttp/guzzle": "~6.0"
   }
}