feat: Black formatting for pushes and pull requests

[needlesslygrim]

Feature description

Using the black GitHub action:

name: Lint

on: [push, pull_request]

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - uses: psf/black@stable

This would make sure all code style is the same no matter who contributes it.

Additional Context

Here's some more information about the template

Did you read the Code of Conduct?

• I have read the Code of Conduct.

[0xMRTT]

There is already a linter which run only on PR