Add check that groups are bool in multivalid methods #308

	name: Python linting

	on:
	pull_request:
	branches: [main]
	push:
	branches: [main]

	jobs:
	lint:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2

	- name: Set up Python 3.9
	uses: actions/setup-python@v2
	with:
	python-version: 3.9

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install black

	- name: Run Black
	run: black --check --diff --verbose fortuna

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