Pybtex-docutils

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* Bump required docutils version to 0.14.

* Add tests for docutils 0.14 and 0.18 in github workflow.

* Fix tests for docutils 0.17 and lower (fixes issue 22, reported by
kloczek).

* Drop Python 3.6 support.

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* New ``simplebibliography``
directive, which will generate a citation for every entry in the specified
bib files, intended for simple single document workflows that do not require
the full power of Sphinx.

* Fix deprecation warning with docutils 0.18 (see issue 21, reported by
drammock).

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* Add py.typed so mypy finds the type annotations.

* Switch to github actions for regression testing.

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* Drop Python 2.7, 3.4, and 3.5 support.

* Add type annotations.

* Add support for sub and sup tags.

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* Drop Python 3.3 support.

* New footnote and footnote_reference methods for docutils footnote
support.