Human-friendly-pedantic-timedelta

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- Update docs and DX/CI tooling.

(No new features or bugs fixed.)

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- Add format options: field_width:, precision, and abbreviate.

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- Documentation updates.

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- License change: Release under MIT.

- "I am the only developer, and I approve this change!"

- Drop Python 2.x and 3.4 support.

- Documentation improvements.

- DX [Developer eXperience] tooling:

- Migrate project settings from ``setup.py`` to ``setup.cfg``
(to specify project-specific metadata in config, not code).

- Integrate `setuptools_scm <https://github.com/pypa/setuptools_scm/>`__
(use SCM for version management).

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- Update to modern ReadTheDocs theme.

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- Burn PyPI-test release.