Platformdirs

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- Drop python 3.6 support

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- Add ``user_documents_dir``

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- Add ``user_runtime_dir`` and its path-returning equivalent (37)

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- Unix: Fallback to default if XDG environment variable is empty

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- Add ``readthedocs.org`` documentation via Sphinx
- Modernize project layout
- Drop Python 2.7 and 3.5 support
- Android support
- Add type annotations
- Reorganize project layout to platform specific classes, see
:class:`PlatformDirsABC <platformdirs.api.PlatformDirsABC>` and it's implementations:
:class:`Android <platformdirs.android.Android>`, :class:`MacOS <platformdirs.macos.MacOS>`,
:class:`Unix <platformdirs.unix.Unix>` and :class:`Windows <platformdirs.windows.Windows>`
- Add ``*_path`` API, returning :class:`pathlib.Path <pathlib.Path>` objects instead of :class:`str`
(``user_data_path``, ``user_config_path``, ``user_cache_path``, ``user_state_path``, ``user_log_path``,
``site_data_path``, ``site_config_path``) - by `papr <https://github.com/papr/>`_

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- Fix ``__version__`` and ``__version_info__``