Changing guzzle adapter options

I've come across this issue while testing your api. Guzzle throws an exception complaining there's no ca file on a windows box. For those OS' without a default known ca file, [see guzzle verify](https://guzzle.readthedocs.io/en/stable/request-options.html#verify), it is not possible to set a default ca-file without altering the php.ini or PATH environment. To solve this issue,

**Either**

//to set options to the guzzle client
public getClient() { return $this->client; }

**Or**

public function __construct(Auth $auth, string $baseURI = null, $guzzleConfig = [])
{
if ($baseURI === null) {
$baseURI = 'https://api.cloudflare.com/client/v4/';
}

$headers = $auth->getHeaders();

$config = [
'base_uri' => $baseURI,
'headers' => $headers,
'Accept' => 'application/json'
] + $guzzleConfig;

$this->client = new Client($config);
}

**Or**

public function __construct(Auth $auth, string $baseURI = null, $caFile = false)
{
if ($baseURI === null) {
$baseURI = 'https://api.cloudflare.com/client/v4/';
}

$headers = $auth->getHeaders();

$config = [
'base_uri' => $baseURI,
'headers' => $headers,
'Accept' => 'application/json'
];

if ($caFile !== false) $config['verify'] = $caFile;

$this->client = new Client($config);
}

can be done.