Radon

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- Prevent tomllib error when the `toml` module is not available

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- Fix typo in changelog, by cclauss: 229
- Add support for `match` pattern in Python 3.10+, by DolajoCZ: 227
- Fix typo in Markdown export, reported by huornlmj: 231
- Remove unnecessary "future" dependency, by mgorny: 234
- Add `pyproject.toml` support, by ajslater: 236
- Allow Mando v0.7.1, by ajslater: 237
- Fix HCHarvester JSON results format, by benabel: 240

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- Allow forcing colored output on/off, thanks msabramo: 218
- Synchronize trove classifiers with tested versions, thanks D3X: 222

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- Drop support for flake8 < 3.x (removes `flake8-polyfill` dependency), by
joxl: 219

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- Add back `flake8-polyfill` dependency because conditional extra does not work
as intended, reported by joxl: 217

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- Fix CC calculation for try-except-else blocks with multiple statements,
thanks justWerns: 212
- Fix CC type field in Markdown output, thanks 4l1fe: 213