Add directories to delete for Python

[pawamoy]

I guess this is all that is needed?

Implements #44

[tbillington]

Yep that should be all that's required :)

Looks like it the linter would prefer you keep them on the same line :D

-const PROJECT_PYTHON_DIRS: [&str; 3] = [
-    "__pycache__",
-    "__pypackages__",
-    ".venv",
-];
+const PROJECT_PYTHON_DIRS: [&str; 3] = ["__pycache__", "__pypackages__", ".venv"];

[pawamoy]

Fixed it directly within GitHub's interface, don't forget to squash before merging/rebasing 🙂