Remove deprecated asyncio coroutine decorator, handle session closing

[frenck]

This PR fixes #3, by converting the old @asyncio.coroutine/yield from syntax to the new Python async/await syntax introduced in Python 3.5.

This removes Python 3.4 compatibility but prepares for Python 3.10. I've adjusted the package classifiers to match that.

Additionally, added a small change that would not close a passed session. Only self-created sessions should be cleaned up/closed. This prevents the accidental closing of sessions not managed by this package.

⚠️ I don't have access to an account for testing and thus need verification.

[balloob]

@titilambert could you take a look at this and merge/release it? It prevents us from adopting Python 3.11

[titilambert]

@balloob Sorry for the delay.
I was thinking removing the integrations from HA since I'm not using it and I saw 0 active users. What do you think ?

[titilambert]

[titilambert]

I'm currently asking the HA Quebec community if there is any user ...

[frenck]

Thanks, @titilambert 👍

Don't forget to tag a release when ready, so we can upgrade the package on the Home Assistant end.

../Frenck

[titilambert]

@frenck I just pushed the new version 2.1.2 to pypi .
@balloob I asked the Quebec community if someone were using it, and I found nobody ...
So I guess you should delete it.

[frenck]

I don't see usage on the public analytics of HA either. Yet, will bump for now and start an deprecation period after that.