Exclude pyside2 on Python 3.8
Exclude pyside2 on Python 3.8

Unfortunately PySide2 on Python 38 is raising errors like:

    qtbot = <pytestqt.qtbot.QtBot object at 0x7fcf19b1d7f0>

        @pytest.fixture
        def event_recorder(qtbot):
    >       class EventRecorder(qt_api.QWidget):
    E       TypeError: 'Shiboken.ObjectType' object is not iterable

pytest-dev/pytest-qt,The-Compiler/pytest-qt