Avoid pytest-3.8.0 on windows
This PR works around the failing unit tests on windows by excluding pytest-3.8.0 from the build, it seems that version introduced a change. See #894 for progress on actually fixing it.
This PR works around the failing unit tests on windows by excluding pytest-3.8.0 from the build, it seems that version introduced a change. See #894 for progress on actually fixing it.