update usage #150

	name: Publish Python 🐍 distributions 📦 to PyPI
	on: push
	jobs:
	build-n-publish:
	name: Build and publish Python 🐍 distributions 📦 to PyPI
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@master
	with:
	fetch-depth: 10
	- name: Set up Python 3.7
	uses: actions/setup-python@v1
	with:
	python-version: 3.7
	- name: Install pypa/build
	run: \|
	python3 -m pip install wheel
	python3 -m pip install -r requirements.txt
	- name: Build targz and wheel
	run: \|
	python3 setup.py sdist
	python3 build_wheel.py
	- name: Publish distribution 📦 to PyPI
	if: startsWith(github.ref, 'refs/tags')
	uses: pypa/gh-action-pypi-publish@release/v1
	with:
	skip-existing: true
	password: ${{ secrets.PYPI_API_TOKEN }}

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