Adds a new test case for req group in optional group #1448

	name: linting

	on: [push]

	jobs:
	linting:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.8
	uses: actions/setup-python@v2
	with:
	python-version: 3.8
	- name: Install dependencies
	run: \|
	git submodule sync --recursive
	git submodule update --init --recursive --jobs=4
	python -m pip install --upgrade pip
	- name: Install package
	run: \|
	python -m pip install --no-deps .
	- name: Install dev requirements
	run: \|
	python -m pip install -r dev-requirements.txt
	- name: pycodestyle
	run: \|
	python -m pycodestyle --ignore=E501,E701,E731,W503 pynxtools tests --exclude=pynxtools/definitions
	- name: pylint
	run: \|
	python -m pylint pynxtools tests --ignore definitions
	- name: mypy
	run: \|
	python -m mypy --ignore-missing-imports --follow-imports=silent --no-strict-optional --exclude=pynxtools/definitions pynxtools tests

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