Log Message:
py-xdis: updated to 4.2.2

4.2.2:
Add Python versions: 3.6.10, 3.7.6. 3.8.1,
Update 3.9-dev to 3.9.0alpha2
Add interpolation of FUNCTION_CALL_{KW,EX} argument for 3.7-3.9
Better output of complex type values

4.2.1:
Correct and clean up compiler flags. Add 3.5+ ITERABLE_COROUTINE and
3.6+ ASYNC_GENERATOR.
Clean up PYPY 3.6 flags and opcodes Many thanks again to Arman Rigo.
Split PYPY specfic compiler-specific flags into its own thing.