updated github action #138

	name: Package build

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

	jobs:
	package:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.10
	uses: actions/setup-python@v2
	with:
	python-version: '3.10'
	- name: Install system dependencies
	run: sudo apt-get install -y graphviz libgraphviz-dev

	- name: Install build dependencies
	run: python -m pip install --upgrade pip wheel twine build
	- name: Build package
	run: python -m build
	- name: Check package
	run: twine check --strict dist/*.whl

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