1.2.1

• Do not require --testdox parameter when --force-testdox is used
• Register pytest.mark.describe and pytest.mark.it even when the testdox output is not activated
• Add "official" support to Python 3.8

Thanks @spumer for the bug report (#31), @netolyrg for the bug fix (#32) and @RomuloOliveira for the usual code review