Remove ClassLoader.py

[kurtmckee]

Removed

• Remove ClassLoader.py.

  importlib, in the Python standard library, is sufficient. This also reduces the number of licenses in use in the repo.

• Remove a reference to ClassLoader.py in the pre-commit config.

[coveralls]

coverage: 65.481% (+0.007%) from 65.474%
when pulling 4210e31 on kurtmckee:rm-class-loader
into 042ab5f on LudovicRousseau:master.

[LudovicRousseau]

Please do not modify the file .pre-commit-config.yaml in the same commit.

In fact I would like to keep the comments in .pre-commit-config.yaml as I will use them for other Python projects.

[kurtmckee]

Is it acceptable to remove the reference to ClassLoader.py in the pre-commit config? Perhaps something like:

"You may need to run pre-commit run -a multiple times to ensure pyupgrade has applied all intermediary syntax updates."

[kurtmckee]

I've un-done the removal of the comments in the pre-commit config, though I did remove the reference to ClassLoader.py and tried to make the comments more generic so they would apply to any repository, not just this one.