Support lists for multiple values #35
Description
The Django backend has to do this all by itself right now:
https://github.com/themartorana/python-postmark/blob/master/postmark/django_backend.py#L58
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The Django backend has to do this all by itself right now:
https://github.com/themartorana/python-postmark/blob/master/postmark/django_backend.py#L58