Reformatted `CourseManagement` using pylint

[kaelabook]

Description

I enabled pylint and made all the requested formatting changes in CourseManagement in accordance to the PEP8 standards. Please double-check this and make sure I didn't miss anything. (I basically just copied and pasted Braden's pull request)

Issues

Closes #349

Type of change

Select one or more of the following:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] Other (describe below)
  • [x] Enhancement to reformat code

How Has This Been Tested?

• [ ] Made sure all commands inside the cog still functioned properly

Checklist:

• [x] All local commits have been pushed to remote
• [x] All changes on the base branch have been merged into this branch, either by rebase or merge
• [x] My code is PEP-8 compliant (excluding maximum line length, keep that to 100ish characters)
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have added Google Docstrings for all new functions/methods
• [x] I have made corresponding changes to the documentation

[kaelabook]

So, it actually works perfectly fine, however it does change the commands to snake-case and I'm not entirely sure if we want to do that or not.