Radon

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- Use UTF-8 or RADONFILESENCODING to open files: 86
- Fix raw analysis bug on docstrings: 106

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- Use flake8-polyfill in order to keep compatibility with Flake8 2.x and 3.x:
92

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- Add fingerprint to Code Climate issues: 88.
- Ensure the Code Climate issues have integer location values: 89.
- Count ``async def``, ``async for`` and ``async with`` towards CC: 90.

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- Modify behaviour of ``--show-closures``. Now inner classes are added to the
output as well: 79.
- Fix bug in ``is_multiline_string``: 81.

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- Add plugin for flake8 tool: 76.

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- The XML output now contains the line numbers: 75.