Update radon to 4.0.0

[pyup-bot]

This PR updates radon from 2.1.1 to 4.0.0.

Changelog

4.0.0

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- Support file configuration overrides, thanks tonybaloney: 179
- Add support for analyzing Jupyter notebooks, thanks tonybaloney: 181

3.0.1

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- Automatically exclude binary files, instead of producing an error: 166

3.0.0

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- Include files with no extension but a Python shebang (thanks hawkeyej): 155
- Fix calculation of total complexity for classes: 156
- Update Colorama dependency to avoid conflicts with pytest: 164
- Fix raw metrics, which were completely broken

2.4.0

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- Add a `__main__` module (thanks douardda): 153
- Add --output-file option (thanks douardda): 154

2.3.1

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- Quickfix for Python 2.7
- Add official Python 3.7 support

2.3.0

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- Add Halstead command and harvester (thanks rwbogl): 136
- Add --json, --exclude, --ignore to `radon hal` (thanks rwbogl): 138
- Add --functions to `radon hal` (thanks rwbogl): 147
- Add documentation for the `radon hal` subcommand (thanks rwbogl): 150

2.2.0

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- Add an option to show closures when Radon is used from flake8: 135

Links

• PyPI: https://pypi.org/project/radon
• Changelog: https://pyup.io/changelogs/radon/
• Docs: https://radon.readthedocs.org/

[coveralls]

Coverage remained the same at 76.333% when pulling 02af099 on pyup-update-radon-2.1.1-to-4.0.0 into 1b65462 on master.

[pyup-bot]

Closing this in favor of #115