Remove reference to typing.Deque (added in Python 3.6.1)

[jkeljo]

Description:

The setup script claims a minimum Python version of 3.6.0, but when I run with Python 3.6.0 it chokes on an import of Deque from the typing module, since that was added in 3.6.1. This PR removes the import.

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly. Update and include derived files by running python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

If the code does not interact with devices:

• Tests have been added to verify that the new code works.

[scop]

Side note: should make sure our test and dev environments correspond to what we say the minimum version is. So if it's 3.6.0, need to develop and test with that, not (only) e.g. 3.6.9. Will fix up my local pyenv now, and have a look at what can be done to the CI setups.

[jkeljo]

@scop judging by the different responses to your two PRs, it looks like there's some disagreement as to whether this is even an issue. Either you're right, and the test environments should be updated to use the minimum required version, or the minimum required version should bump every time a new Python bugfix release introduces a new API.

I'd love to get a definitive stance on that. I know in the past I've avoided using APIs if I noticed they had been introduced in a bugfix release, and when I set up my latest development environment I deliberately put 3.6.0 in my venv so that it would catch that kind of thing. If I'm allowed to develop for 3.6.9 I'll gladly do so.

I imagine this PR isn't the right place to hash this out though... where is?

[scop]

Looks good, approved assuming CI will start to pass once the seemingly unrelated issues (e.g. #26060) are fixed (can't merge before they pass it seems). Also filed home-assistant/architecture#278 to get the micro version issue sorted out.