Pre-commit framework, hooks, CI

[bch0w]

This repository would benefit from a fully-fledged pre-commit framework and continuous integration. Potential dependencies that would be added include: Flake8, Black, pre-commit, codecoverage, Travis CI.

Here is a task list for including each of these framework tools:

• Flake8
• Black
• pre-commit
• codecoverage
• Travis CI