Sphinxcontrib-katex

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* Added: support for Python 3.9
* Added: support for Sphinx>=4.0.0
* Added: tests for Windows and macOS
* Changed: switch to KaTeX 0.13.11
* Changed: switched CI tests from Travis to Github Actions
* Changed: running sphinx will now fail in pre-render mode
if KaTeX fails
* Removed: support for Python 2.7, 3.4, 3.5

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* Fixed: Sphinx>=4.0.0 is not supported at the moment

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* Fixed: label of fraction example in docs

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* Added: fraction example to docs
* Changed: switch to KaTeX 0.12.0
* Changed: add small top and bottom padding to equations

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* Fixed: run katex under Windows

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* Changed: switch to Katex 0.11.1
* Changed: add tests for Python 3.7 and 3.8