Added the option "smtp-ssl-protocol" to make STARTTLS work on Python 3.3+

Signed-off-by: Thiago Coutinho <root@thiagoc.net>
CHANGELOG: Document this branch

Documents the following commits:
* 2369d56 Added the option "smtp-ssl-protocol" to make STARTTLS work
  on Python 3.3+

Signed-off-by: W. Trevor King <wking@tremily.us>
Merge branch 'ssl-protocol'

* ssl-protocol:
  CHANGELOG: Document this branch
  Added the option "smtp-ssl-protocol" to make STARTTLS work on Python 3.3+

Signed-off-by: W. Trevor King <wking@tremily.us>