Aiosmtplib

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- Bugfix: Removed buggy close connection on __del__

- Bugfix: Fixed old style auth method parsing in ESMTP response.

- Bugfix: Cleanup transport on exception in connect method.

- Cleanup: Simplified SMTPProtocol.connection_made, __main__

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- Bugfix: Close connection lock on on SMTPServerDisconnected

- Feature: Added cert_bundle argument to connection init, connect and starttls
methods

- Bugfix: Disconnected clients would raise SMTPResponseException: (-1 ...)
instead of SMTPServerDisconnected

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- Bugfix: Commands were getting out of order when using the client as a context
manager within a task

- Bugfix: multiple tasks calling connect would get confused

- Bugfix: EHLO/HELO responses were being saved even after disconnect

- Bugfix: RuntimeError on client cleanup if event loop was closed

- Bugfix: CRAM-MD5 auth was not working

- Bugfix: AttributeError on STARTTLS under uvloop

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Initial feature complete release with stable API; future changes will be
documented here.