Comment 12 for bug 1274135

I think the tox 1.7.0 behavior is a bug, though upstream doesn't seem to be convinced of that yet.

I just commented to reinforce @cboylan's point that this is a tox bug and it should be fixed.

https://bitbucket.org/hpk42/tox/issue/150/posargs-configerror#comment-9481536