Log Message:
py-xdis: updated to 4.0.3

4.0.3:
Support 3.8.0beta2; Code38 type with posonlyargcount field
Add Python versions 3.4.10, 3.7.4 and 3.6.9
script no longer works to install pydisasm; entry_points still works
Add pypy 3.6 opcode formatting for MAKE_FUNCTION and EXTENDED_ARG
Add format_CALL_function and use it or pypy36
Start using "blacken" to reformat Python files