[Checkins] [zopefoundation/zope.interface] d952fc: Make tox -p auto handle coverage right

[Marius Gedminas]

  Branch: refs/heads/drop-py34
  Home:   https://github.com/zopefoundation/zope.interface
  Commit: d952fc3b3008ab201fdb749918a6da0462557d6a
      https://github.com/zopefoundation/zope.interface/commit/d952fc3b3008ab201fdb749918a6da0462557d6a
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-08-18 (Sun, 18 Aug 2019)

  Changed paths:
    M tox.ini

  Log Message:
  -----------
  Make tox -p auto handle coverage right

BTW I had some problems using tox -p auto before I started passing
--parallel-safe-build.  I'm not sure why that isn't on by default.