Dawg

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* Python 3.8 support is added
* Python 3.2, 3.3 and 3.4 support is dropped
* Extension is rebuilt with Cython 0.29.15

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* extra type annotations are added to make the code a bit faster;
* mercurial mirror at bitbucket is dropped;
* wrapper is rebuilt with Cython 0.22.

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* ``DAWG.b_prefixes`` method for avoiding utf8 encoding/decoding
(thanks Ikuya Yamada);
* wrapper is rebuilt with Cython 0.21.1.

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* Wrapper is rebuilt with Cython 0.20.2 to fix some issues.

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* Switched to setuptools;
* some wheels are uploaded to pypi.

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* Fixed a bug in DAWG building: input should be sorted according to its
binary representation.