Migrate to pyproject.toml and towncrier fragments #24

	name: Pull request
	on:
	pull_request:
	branches: [master]
	jobs:
	Lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Check formatting
	uses: "lgeiger/black-action@master"
	with:
	args: ". -l 79 --check"
	check-changelog:
	name: Check changelog fragment
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Check for changelog fragment
	run: \|
	FRAGMENTS=$(find changelog.d -type f ! -name '.gitkeep' \| wc -l)
	if [ "$FRAGMENTS" -eq 0 ]; then
	echo "::error::No changelog fragment found in changelog.d/"
	echo "Add one with: echo 'Description.' > changelog.d/\$(git branch --show-current).<type>.md"
	echo "Types: added, changed, fixed, removed, breaking"
	exit 1
	fi
	Test:
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-latest, windows-latest]
	steps:
	- name: Checkout repo
	uses: actions/checkout@v3
	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: 3.9
	- name: Install package
	run: make install
	- name: Run tests
	run: make test
	- uses: codecov/codecov-action@v3
	- name: Build package
	run: make build
	- name: Test documentation builds
	run: make documentation

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