Log Message:
py-xdis: updated to 5.0.4

5.0.4:
Add python versions 3.6.12, 3.7.9
extended arg disassembly handling for {LOAD,STORE}_ATTR

5.0.3:
Add versions 3.8.5, 3.7.8, and 3.6.11
Clarify changes to 3.8 ROT_FOUR
Update 3.9 magics and opcodes

5.0.2:
Add Python 3.8.4 as a 3.8 release
pydisasm.py Python 3.3 tolerance
Make pydoc's version reporting show xdis's version

5.0.1:
Two small improvements that are usefil in the forthcoming trepan3k release:

interpret RAISE_VARARGS's argc parameter. Some other formatting was extended too
check_object_path() is more leanient in the path name (it doesn't have to end in \ 
.py anymore), but it is
more stringent about what constitutes Python source (it compiles the text to \ 
determine validity)
In the above is_python_source() and is_bytecode_extension() are used. They are \ 
also exported.

5.0.0:
Disassembly format and options have simplified and improved.