Log Message:
py-xdis: updated to 4.1.2

4.1.2 pre Halloween redux:
Python 3.8.0 magic changed
More Pypy 3.6 tolerance
Fixed DeprecationWarning

4.1.1 pre-Halloween:
Fix unmarshaling 3.4+ object_ref bugs.
A big thanks to Armin Rigo of the PyPy team.
Add Pypy 3.6+ disassembly, e.g. pypy3.6-7.1.0 and pypy3.6-7.1.1
Add Python 3.7.5, 2.7.16, 2.7.17rc1, and 2.7.15candidate1 as a valid releases
convert unmarshal if .. elif code to a dictionary lookup with function entries
Handle newer Python importlib