Python 3.9 - Task exception was never retrieved

[Lithimlin]

I just pulled the newest version of this library and I'm still getting the following error when using Python 3.9

Task exception was never retrieved
future: <Task finished name='Task-2' coro=<BaseEventLoop.create_connection() done, defined at /usr/lib/python3.9/asyncio/base_events.py:967> exception=gaierror(-2, 'Name or service not known')>

This is the same as already mentioned in #59 (comment).
To reproduce this, I simply ran the imap_fetch.py example provided.

[bamthomas]

it is because you have to replace imap.server account_id and password by your imap server and credientials.

I have tested it, there was an error because it was not using the new bytes type in Response.
I have fixed the test, and it is working fine now.