Python 3.9 compatibility?

[Daniel Nathan Gray]

Archlinux recently upgraded to Python 3.9 and now I'm seeing this:

Traceback (most recent call last):
  File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 567, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 884, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 775, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.VersionConflict: (j2cli 0.3.10 (/home/dngray/.local/lib/python3.9/site-packages), Requirement.parse('j2cli==0.3.12b0'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/sbin/j2", line 33, in <module>
    sys.exit(load_entry_point('j2cli==0.3.12b0', 'console_scripts', 'j2')())
  File "/usr/sbin/j2", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/usr/lib/python3.9/importlib/metadata.py", line 77, in load
    module = import_module(match.group('module'))
  File "/usr/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/home/dngray/.local/lib/python3.9/site-packages/j2cli/__init__.py", line 4, in <module>
    import pkg_resources
  File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3239, in <module>
    def _initialize_master_working_set():
  File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3222, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3251, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 569, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 582, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python3.9/site-packages/pkg_resources/__init__.py", line 770, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'j2cli==0.3.12b0' distribution was not found and is required by the application