Rutter

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- Add support for Python 3.11.

- Drop support for Python 2.7, 3.5, and 3.6.

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- Add support for Python 3.9, and 3.10.

- Remove DeprecationWarning from using ``collections.abc``.

- Move tests to GitHub actions.

- Move test suite to py.test.

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- Add support for Python 3.5, 3.6, 3.7, and 3.8.

- Drop support for Python 2.6, 3.2, 3,3, and 3.4.

- Add support for PyPy3.

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- Fix generation of ``long-description`` PyPI metadata.

- Add Sphinx documentation.

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- Initial version.