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Pull #23

travis-ci

Fix text/bytes issue in MailDir for Python 3.

`Maildir.newMessage` returns a MaildirMessageWriter with a file handle opened
in text mode, see
https://github.com/zopefoundation/zope.sendmail/blob/<a class=hub.com/zopefoundation/zope.sendmail/commit/2ee8b0a454ff484335e6b65b9d46a695309a2b2f">2ee8b0a45/src/zope/sendmail/maildir.py#L110
(mode is 'w' not 'wb')

But `MaildirMessageWriter.write` writes bytes to this file handle, see
https://github.com/zopefoundation/zope.sendmail/blob/2ee8b0a454ff484335e6b65b9d46a695309a2b2f/src/zope/sendmail/maildir.py#L131-L132

This commit changes the implementation to use text for Python 3.

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