fix pyyaml < 5.3.1 #17

	name: CI
	on:
	push:
	branches: [master]
	pull_request:

	jobs:
	lint:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.8]
	steps:
	- uses: actions/checkout@v2

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v1
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install --upgrade poetry
	poetry --version
	poetry install --no-interaction

	- name: Lint
	run: poetry run pre-commit run --all-files

	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.6, 3.7, 3.8, 3.9]
	steps:
	- uses: actions/checkout@v2

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v1
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install --upgrade poetry
	python -m pip install --upgrade codecov
	poetry --version
	poetry install --no-interaction

	- name: Test
	run: \|
	make cover

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