Wrong order of message appending

[marwain91]

The SendGridTransport.php:113 is appending the e-mail body in incorrect order:

        if (!empty($message->getBodyHtml())) {
            $this->_reqParams['content'][] = (object)[
                'type' => 'text/html',
                'value' => trim($message->getBodyHtml()),
            ];
        }
        if ($emailFormat == 'both' || $emailFormat == 'text') {
            $this->_reqParams['content'][] = (object)[
                'type' => 'text/plain',
                'value' => trim($message->getBodyText()),
            ];
        }

This throws an error when using $this->setEmailFormat('both'); as SendGrid expects the text/plain format before the text/html one.