Update dependency nox to v2020

[renovate]

This PR contains the following updates:

Package	Update	Change
nox (source)	major	==2019.11.9 -> ==2020.5.24

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Release Notes

theacodes/nox

v2020.5.24

Compare Source

• Add new options for venv_backend, including the ability to set the backend globally. (#​326)
• Fix various typos in the documentation. (#​325, #​326, #​281)
• Add session.create_tmp. (#​320)
• Place all of Nox's command-line options into argparse groups. (#​306)
• Add the --pythons command-line option to allow specifying which versions of Python to run. (#​304)
• Add a significant amount of type annotations. (#​297, #​294, #​290, #​282, #​274)
• Stop building universal wheels since we don't support Python 2. (#​293)
• Add the ability to specify additional options for the virtualenv backend using venv_params. (#​280)
• Prefer importlib.metadata for metadata loading, removing our dependency on pkg_resources. (#​277)
• Add OmegaConf and Hydra to list of projects that use Nox. (#​279)
• Use a more accurate error message, along with the cause, if loading of noxfile runs into error. (#​272)
• Test against Python 3.8. (#​270)
• Fix a syntax highlighting mistake in configuration docs. (#​268)
• Use stdout.isatty to finalize color instead of stdin.isatty. (#​267)

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