doc: add missing shell command #55

	name: lint
	on: [push, pull_request]
	jobs:
	run-linters:
	name: Run linters
	runs-on: ubuntu-latest

	steps:
	- name: Check out Git repository
	uses: actions/checkout@v2

	- name: Set up Python
	uses: actions/setup-python@v1
	with:
	python-version: 3.8

	- name: Install Python dependencies
	run: pip install black flake8

	- name: Run linters
	uses: wearerequired/lint-action@v2
	with:
	auto_fix: false
	black: true
	flake8: false

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