Bump version to 0.4.2; update CHANGELOG for new version #156

	# Install Poetry, dependencies, run tests with a range of Python versions on Ubuntu Linux

	name: Python package with Poetry

	on:
	push:
	branches: [ "main", "dev" ]
	pull_request:
	branches: [ "main", "dev" ]

	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11"]

	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install Poetry
	uses: snok/install-poetry@v1
	with:
	virtualenvs-create: true
	virtualenvs-in-project: true
	- name: Install project
	run: poetry install --without dev # installs main and test groups
	- name: Lint with isort
	# by default: exit with error if imports are not properly sorted; show diffs
	uses: isort/isort-action@master
	- name: Lint with black
	# by default: exit with error if code is not properly formatted; show diffs
	uses: psf/black@stable
	- name: Lint with ruff
	# by default: exit with error if rule violations
	uses: chartboost/ruff-action@v1
	- name: Check typing with mypy
	run: \|
	source $VENV
	mypy .

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