Fixed mail transport when not specified in scheduler constructor

Mails will fail if no transport is defined on scheduler constructor.

The `getEmailConfig` will default the transport to Sendmail.

Author: peppeocchi

src/GO/Traits/Mailer.php

@@ -42,10 +42,10 @@ public function getEmailConfig()
      */
     private function sendToEmails(array $files)
     {
-        $mailer = new \Swift_Mailer($this->emailConfig['transport']);
-
         $config = $this->getEmailConfig();
 
+        $mailer = new \Swift_Mailer($config['transport']);
+
         $message = (new \Swift_Message())
             ->setSubject($config['subject'])
             ->setFrom($config['from'])