Update radon to 5.1.0

[pyup-bot]

This PR updates radon from 2.1.1 to 5.1.0.

Changelog

5.1.0

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

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

5.0.1

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

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

4.5.2

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

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

4.5.1

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

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

4.5.0

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

- Add ``--md`` option to ``cc`` command to export results as Markdown (thanks
to kanekotic): 205
- Add async function support to Halstead visitor (thanks to rharish101): 208

4.4.0

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

- Use utf-8 as the default encoding on Python 3.0+: 203
- Allow custom config file path through the RADONCFG env var: 207

4.3.2

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

- Move `Flake8Checker` to separate, isolated module (thanks to tribals): 200

4.3.1

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

- Separate `flake8-polyfill` to extra requirements (thanks to tribals): 189

4.2.0

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

- Fix for Python 2.7 (thanks to edwinelisia): 191
- Pin Colorama to different versions depending on the Python version (thanks to
douardda): 193

4.1.0

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

- Support Python 3.8 (thanks to brnsnt): 185

4.0.0

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

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

3.0.1

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

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

3.0.0

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

- 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

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

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

2.3.1

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

- Quickfix for Python 2.7
- Add official Python 3.7 support

2.3.0

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

- 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

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

- 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/

[pyup-bot]

Closing this in favor of #344