Keshav Kini fe5f82fd99 python36Packages.black: fix broken dependency ... In PR #96456, black was upgraded from 19.10b0 to 20.8b1. This new version of black depends on the dataclasses module, but that was only introduced into the standard library in Python 3.7; earlier versions of Python require the backport package of the same name. This commit addresses the missing dependency.		2020-12-11 15:48:59 +01:00
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