Fix error on project resources

[lamasfoker]

Reproduce steps:

<?php

require_once 'vendor/autoload.php';

// create a new DigitalOcean client
$client = new DigitalOceanV2\Client();

// authenticate the client with your access token which can be
// generated at https://cloud.digitalocean.com/settings/applications
$client->authenticate('your_access_token');

$client->projectResource()->getDefaultProjectResources();

Error display:

Cannot assign stdClass to property DigitalOceanV2\Entity\ProjectResource::$links of type array