|pywikibot/core : master||dev-requirements.txt: Require pytest-attrib>=0.1.3|
This should now be fixed upstream.
Here is the pywikibot-core travis build where it works https://travis-ci.org/AbdealiJK/pywikibot-core/builds/132529623
I've tested it on pytest-attrib's appveyor - https://ci.appveyor.com/project/AbdealiJK/pytest-attrib/build/1.0.22
May as well also update tox.ini and .travis.yml to use --attr / --eval-attr for nose and pytest in the same update, as that will also require a different minimum version of pytest-attrib