Update flake8-isort to 3.0.1

[pyup-bot]

This PR updates flake8-isort from 2.8.0 to 3.0.1.

Changelog

3.0.1

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

- Work around `FailedToLoadPlugin` exception by requiring `isort` 4.x. Likewise,
pin the major version of all dependencies, to reduce risk of any future
incompatibilities.
[pkolbus]

3.0.0

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

- Let `isort` search the configuration, rather than `flake8-isort` try to find it.
[jnns]

2.9.1

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

- Fix flake8 warning.
[sobolevn]

2.9.0

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

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

Links

• PyPI: https://pypi.org/project/flake8-isort
• Changelog: https://pyup.io/changelogs/flake8-isort/
• Repo: https://github.com/gforcada/flake8-isort

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