OSError: [WinError 6] The handle is invalid, again

Similar to #44, unsure if it's a regression. The error pops up on `git gud init`.

Traceback:
```
Exception ignored in:
Traceback (most recent call last):
File "E:\Programming\Python\Python38-32\lib\subprocess.py", line 945, in __del__
self._internal_poll(_deadstate=_maxsize)
File "E:\Programming\Python\Python38-32\lib\subprocess.py", line 1344, in _internal_poll
if _WaitForSingleObject(self._handle, 0) == _WAIT_OBJECT_0:
OSError: [WinError 6] The handle is invalid
Welcome to Git Gud!
Type
git gud goal
```

My output of `pip list`:
```
Package Version
------------------- -------
git-gud 0.4.3
gitdb 4.0.9
GitPython 3.1.7
importlib-resources 5.9.0
pip 22.2.2
PyYAML 6.0
setuptools 41.2.0
smmap 5.0.0
zipp 3.8.1
```

I am running in a Python 3.8.1 venv environment on Windows 10.