Update dependency radon to v1.5.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
radon (source)	==1.1.1 -> ==1.5.0

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Release Notes

rubik/radon (radon)

v1.5.0

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

v1.4.2

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

v1.4.0

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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.

v1.3.2

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v1.3.1

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v1.3.0

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

v1.2.2

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• Add plugin for flake8 tool: #​76.

v1.2.1

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• The XML output now contains the line numbers: #​75.

v1.2

Compare Source

• Add plugin for flake8 tool: #​76.

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