fix: EnumType is not available before 3.11 #68

	name: lint
	on: push
	jobs:
	black:
	name: Lint (black)
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.9]
	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install -r requirements.dev.txt
	if [ -f requirements.txt ]; then
	pip install -r requirements.txt
	else
	pip install -e .
	fi

	- name: Lint with black
	run: black --check .

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