add pyyaml for CI #5

	name: tests

	on: [push, pull_request]

	jobs:
	lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- uses: psf/black@stable
	test:
	runs-on: ubuntu-latest
	needs: lint
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: '3.9'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.txt
	- name: Run tests
	run: \|
	pytest tests

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