Fastrlock

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* Rebuild with Cython 0.29.20 to support Py3.8 and later.

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* Rebuild with Cython 0.28.5.

* Linux wheels are faster through profile guided optimisation.

* Add missing file to sdist.
(patch by Mark Harfouche, Github issue 5)

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* improve cimport support of C-API
(patch by Naotoshi Seo, Github issue 3)

* provide ``fastrlock.__version__``

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* add missing readme file to sdist

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* initial release