Log Message:
py-aiosmtpd: updated to 1.2

1.2:
mprove the documentation on enabling STARTTLS.
Add customizable ident field to SMTP class constructor.
Remove asyncio.coroutine decorator as it was introduced in Python 3.5.
Add Controller docstring, explain dual-stack binding.
Gracefully handle ASCII decoding exceptions.
Fix typo.
Improve Controller ssl_context documentation.
Add timeout feature.