Flake8-isort

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- Fix flake8 warning.
[sobolevn]

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- Add ``python3.8`` support.
[sobolevn]

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- Look for isort configuration on `.flake8` files as well.
[JohnHBrock]

- Document how to install `flake8-isort` on conda.
[marcelotrevisani]

- Look for isort configuration on `pyproject.toml` files as well.
[sanjioh]

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- Improve the README.
[barbossa]

- Fix isort output when pipes are used.
[maerteijn]

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- Use pytest to run tests.
[gforcada]

- New error code I005 isort foundan unexpected missing import.
[charettes]

- Add ``isort_show_traceback`` option to show verbose multi-line output
from ``isort``, turned off by default
[sobolevn]

----------------

- Now requires isort >= 4.3.0.
[jleclanche]