[#47] Annotate optional fields as Optional #144

	# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
	# For more information see: https://help.github.com/actions/language-and-framework-guides/using-python-with-github-actions

	name: Python package

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

	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [3.9]

	steps:
	- 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
	make install
	pip install .
	- name: Lint with flake8
	run: \|
	# stop the build if there are Python syntax errors or undefined names
	make format
	- name: Test with pytest
	run: \|
	make test-cov
	- name: Code Coverage Report
	uses: romeovs/[email protected]
	with:
	github-token: ${{ secrets.GITHUB_TOKEN }}
	lcov-file: ./coverage/lcov.info

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