Log Message:
py-xdis: updated to 4.0.0

release-4.0.0
Expand is_jump_target to True, 'loop', False. This is the reason for the version bump
Remove deprecated opcodes_pypyDD.py files. Use opcode_DDpypy instead.
Fix bug in setting jump offset in wordcode (3.6+) relative jumps.
Note that this works now in Python 3.8 (dev)
Add 3.6{,.1}pypy version
Dry opcodes 3.6 - 3.8