Flake8-isort

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- Nothing changed yet.

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- Switch from `setup.cfg` to `setup.py`.
[deronnax]

- Switch from `setuptools` to `hatchling`.
[gforcada]

- Switch to `main` branch.
[gforcada]

- Use `tox` and `pre-commit` to ease project maintenance.
[gforcada]

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- Drop python 3.7 support.
[gforcada]

- Add preliminary support to Python 3.12.
[gforcada]

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- Drop isort 4.x support.
[gforcada]

- Add support for flake8 6.0.0.
[gforcada]

- Add `--isort-no-skip-gitignore` option to allow temporarily overriding the set
value of isort's `skip_gitignore` option with `False`. This can cause
flake8-isort to run significantly faster at the cost of making flake8-isort's
behavior differ slightly from the behavior of `isort --check`. [gschaffner]

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- Fix broken `add_options` method, again. [casperdcl]

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- Fix broken `add_options` method [casperdcl]