Yamllint

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- Fix ``python_requires`` to comply with PEP 345 and PEP 440

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- Remove runtime dependency ``setuptools`` for Python < 3.8
- Fix ``line_length`` to skip all hash signs starting comment

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- End support for Python 2 and Python 3.4, add support for Python 3.9
- Add ``forbid: non-empty`` option to ``braces`` and ``brackets`` rules
- Fix ``quoted-strings`` for explicit octal recognition
- Add documentation for integration with Arcanist
- Fix typos in changelog and README
- Stop using deprecated ``python setup.py test`` in tests

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- Run tests on Travis both with and without UTF-8 locales
- Improve documentation with default values to rules with options
- Improve documentation with a Python API usage example
- Fix documentation on ``commas`` examples
- Packaging: move setuptools' configuration from ``setup.py`` to ``setup.cfg``
- Packaging: add extra info in PyPI metadata
- Improve documentation on ``yaml-files``
- Fix ``octal-values`` to prevent detection of ``8`` and ``9`` as octal values
- Fix ``quoted-strings`` Fix detecting strings with hashtag as requiring quotes
- Add ``forbid`` configuration to the ``braces`` and ``brackets`` rules
- Fix runtime dependencies missing ``setuptools``
- Add a new output format for GitHub Annotations (``--format github``)
- Fix DOS lines messing with rule IDs in directives

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- Add ``locale`` config option and make ``key-ordering`` locale-aware

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- Revert ``locale`` config option from version 1.24.0 because of a bug