This update for python-uncompyle6, python-xdis fixes the following issues:

python-uncompyle6 was updated to 3.7.4:

* Fragment parsing was borked. This means deparsing in trepan2/trepan3k was broken
* 3.7+: narrow precedence for call tatement
* del_stmt -> delete to better match Python AST
* 3.8+ Add another forelsestmt (found only in a loop)
* 3.8+ Add precedence on walrus operator
* More files blackened
* bump min xdis version
* __doc__ = DocDescr() from test_descr.py was getting confused as a docstring.
* detect 2.7 exchandler range better

update to 3.7.2

* Use newer xdis
* Docstrings (again) which were broken again on earlier Python
* Fix 2.6 and 2.7 decompilation bug in handling "list if" comprehensions
* Handle 3.7+ "else" branch removal adAs seen in `_cmp()` of `python3.8/distutils/version.py` with optimization `-O2`
* 3.6+ "with" and "with .. as" grammar improvements
* ast-check for "for" loop was missing some grammar rules

update to 3.7.0

* The main impetus for this release is to pull in the recent changes from xdis. We simplify imports using xdis 4.6.0.
* There were some bugfixes to Python 3.4-3.8. See the ChangeLog for details

python-xdis was updated to to 5.0.4:

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

- Update to 5.0.1
* Routines for extracting line and offset information from code objects was added.
* Disassembly format and options have simplified and improved.
* Before, we had separate flags and command-line options for whether to show just
the header, and whether to include bytecode ops in the output. Now there is just
a single parameter called `asm_format`, and choice option `--format` (short option `-F`).
* Small fixes and improvements

- Update to 4.6.1:
* A portable version of types.CodeType was rewritten.
* Python 3.8-ish `replace()` method has been added to the portable code types
* Portable code type classes `Code13`, `Code15` have been added to more precisely distinguish Python 1.3 and 1.5 code types. The other portable code classes are `Code2`, `Code3`, and `Code38`.
* the to_native() conversts a portable code type into a native code type
* the `decode_lineno_tab()` method on portable code types from Python 1.5 on decompresses the Python encode line number table into a dictionary mapping offset to line number.
* The module `xdis.code` has been remamed to `xdis.codetype`.
* `load_module()` and `load_module_from_file_object()` now return
a couple more parameters.
* --asm option fixes
* Show sip hash in 3.7+ when that is used
* Handle PEP 552 bytecode-file variations more properly
* Detect more intermediate Python versions in `load_code_from_file_object()`
* 3.8+ posonlyargcount in assembly... rename Kw-only field to Keyword-only
* Add 3.5 canonic bytecode version Marshal `dumps()`
* convert from byte() to str() in dumps() when needed in 3.x
* to_native() convert to bytes from string when needed in 3.x.
* clean up loading code by using float version values rather than magic values
* `stack_effects()` checked against Python 3.4+ is now in place.
* Added `stack_effects()` function to `std.py` since this is part of the API
* `cross_xdis.py` file/module now has `dis.py` functions split off from `bytecod
e.py`
* `Instructions` class is in its own module too.
* Python 2.7.18 added into magics.
* Fix bug in marshal for 3.8+ (include posonlyargcount)
* Go over stack effects from 2.5 to 3.4 using and idea from Maynard
* Expand stack-effect testing
* 3.8.3 added as a valid 3.8 release
* command program `pydisasm` disassembles more Python source files now
* Add better arguemnt formatting on `CALL_FUNCTION` and `MAKE_FUNCTION`
* bytecode.py now has `distb`
* opcode modules now have variable `python_implemenation` which is either "CPyth
on" or "PyPY"
* Reformat a number of files using blacken, and lint using flymake
* Update `__init__.py` exports based on what is used in projects `uncompyle6`, `
decompyle3`, `trepan3k`,
`xasm` and `x-python`
* Remove duplicate `findlinestarts()` code. Remove testing on the Python version and simplify
this where possible.
* get_opcode_module allows either a float and string datatype for the version, and coverts
the bytecode datatype when needed
* Fix a bugs in marshal and unmarshal
* Go over magics numbers, yet again
* Fix a bad bug in handling byte constants in 3.x.