fix #202 #120

	name: Check and Maybe Release Python Package

	on: [push, pull_request]
	jobs:
	release:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	with:
	fetch-depth: 0
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: '3.x'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install --upgrade setuptools setuptools-scm wheel twine toml
	- name: Build package
	run: \|
	python setup.py sdist bdist_wheel
	python setup.py --version
	twine check dist/*
	- name: Publish to pypi
	if: startsWith(github.event.ref, 'refs/tags')
	env:
	TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
	TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
	run: \|
	twine upload dist/*

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