Gocept-jslint

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- Nothing changed yet.

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- Drop support for Python 2.

- Add support for Python 3.9.

- Fix output/encoding handling for Python 3,
especially regarding the ``ignore`` setting.

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- Add support for Python 3.8.

- Migrate to GitHub and GitHub Actions.

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- Add support for Python 3.6 and 3.7.

- Stop testing with Python 2.6.

- Run the tests against currently most recent versions of the dependencies.

- Change testrunner to py.test.

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- Get jshint command from environment (13073).

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- Use jshint instead of jslint.