Pypac

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- Add ability to supply ``PACFile`` to ``pac_context_for_url()``. (52) Thanks alexrohvarger.

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- Make it possible to configure the request for the PAC file. (44) Thanks SeyfSV.
- urlencode proxy username and password. (46) Thanks aslafy-z.

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- Fix possible error when ``dnsResolve()`` fails. (34) Thanks maximinus.

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- Require dukpy 0.2.2, to fix memory leak. (32) Thanks maximinus.
- Change Mac environment marker. (30)
- Support Python 3.7.

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- Require tld 0.9.x. (29)

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- Switch JavaScript interpreter to dukpy. (24)
- Fix ``pac_context_for_url()`` erroring with ``DIRECT`` PAC setting. (27)
- Fix warning about invalid escape sequence (26). Thanks BoboTiG.