Match with botocore codestyle

[gmsantos]

Description of Change

Relates to #951

During a tentative upgrade of botocore to a newer version, it was really difficult to identify real code changes to formating changes because botocore adopted black and isort in their code base (see boto/botocore#2472).

This PR brings the same codestyle changes to aiobotocore to make it easier to bump botocore afterward.

Assumptions

Since I'm planning to follow up with a bump to botocore, I didn't add it to CHANGES.rst or bumped the version release. Let me know if I need to perform it for this PR too.

Checklist for All Submissions

• I have added change info to CHANGES.rst
• If this is resolving an issue (needed so future developers can determine if change is still necessary and under what conditions) (can be provided via link to issue with these details):
  • Detailed description of issue
  • Alternative methods considered (if any)
  • How issue is being resolved
  • How issue can be reproduced
• If this is providing a new feature (can be provided via link to issue with these details):
  • Detailed description of new feature
  • Why needed
  • Alternatives methods considered (if any)

Checklist when updating botocore and/or aiohttp versions

• I have read and followed CONTRIBUTING.rst
• I have updated test_patches.py where/if appropriate (also check if no changes necessary)
• I have ensured that the awscli/boto3 versions match the updated botocore version

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[gmsantos]

On short notice, I realized that flake8-black/black requires Python 3.7

I will probably reuse this PR to bump the Python release too (botocore deprecated Python 3.6 anywhere between 1.25 and 1.27).

[codecov]

Codecov Report

Merging #952 (b57186c) into master (fe3d847) will decrease coverage by 0.00%.
The diff coverage is 88.65%.

@@            Coverage Diff             @@
##           master     #952      +/-   ##
==========================================
- Coverage   86.74%   86.74%   -0.01%     
==========================================
  Files          55       55              
  Lines        5298     5295       -3     
==========================================
- Hits         4596     4593       -3     
  Misses        702      702              

Flag	Coverage Δ
unittests	86.74% <88.65%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiobotocore/_helpers.py	50.00% <0.00%> (-50.00%)	⬇️
aiobotocore/retries/bucket.py	66.66% <ø> (ø)
aiobotocore/retries/special.py	40.00% <0.00%> (ø)
tests/python3.8/test_eventstreams.py	17.64% <0.00%> (ø)
tests/test_ec2.py	100.00% <ø> (ø)
tests/test_lambda.py	97.22% <ø> (ø)
tests/test_sqs.py	100.00% <ø> (ø)
tests/test_waiter.py	100.00% <ø> (ø)
aiobotocore/configprovider.py	13.79% <33.33%> (ø)
tests/test_adaptive.py	35.04% <33.33%> (-1.10%)	⬇️
... and 46 more

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[gmsantos]

@thehesiod friendly ping :)

[thehesiod]

@gmsantos sorry been absolutely swamped, lets c if we can get this through today

[thehesiod]

man they had to go with 79 chars . we may want to increase this by six (await ) to ensure the lines match up

[gmsantos]

we can try, but idk if this will not change for other cases, like lines around 80-85 (alignment will not be consistent in these cases)

[thehesiod]

omg my eyes are burning lol, looks good! But we need to bump version. I can do that in another PR