eEmailMessage.send() errors wtih emark.backends.ConsoleEmailBackend`

[amureki]

Failing test case:

    @pytest.mark.django_db
    def test_send__native_email(self):
        with io.StringIO() as stream:
            backend = backends.ConsoleEmailBackend(stream=stream)
            EmailMessage(
                to=["peter.parker@avengers.com"],
                connection=backend,
            ).send()

        assert Send.objects.count() == 1

Traceback:

tests/test_backends.py:70: in test_send__native_email
    ).send()
.direnv/python-3.11.0/lib/python3.11/site-packages/django/core/mail/message.py:298: in send
    return self.get_connection(fail_silently).send_messages([self])
emark/backends.py:23: in send_messages
    return super().send_messages(email_messages)
.direnv/python-3.11.0/lib/python3.11/site-packages/django/core/mail/backends/console.py:36: in send_messages
    self.write_message(message)
emark/backends.py:77: in write_message
    msg.set_payload(msg.get_payload(0))
../../../.pyenv/versions/3.11.0/lib/python3.11/email/message.py:287: in get_payload
    raise TypeError('Expected list, got %s' % type(self._payload))
E   TypeError: Expected list, got <class 'str'>