/**
* Create a new PostmarkClient.
*
* @param string $serverToken The token associated with "Server" you'd like to use to send/receive email from.
* @param integer $timeout The timeout, in seconds to wait for an API call to complete before throwing an Exception.
*/
function __construct($serverToken, $timeout = 30)
{
parent::__construct($serverToken, 'X-Postmark-Server-Token', $timeout);
}