Update tutorial.rst #392

	# GitHub Action that uses Black to reformat the Python code in an incoming pull request.
	# If all Python code in the pull request is compliant with Black then this Action does nothing.
	# Othewrwise, Black is run and its changes are committed back to the incoming pull request.
	# https://github.com/cclauss/autoblack

	name: autoblack
	on: [pull_request]
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v1
	- name: Set up Python 3.8
	uses: actions/setup-python@v1
	with:
	python-version: 3.8
	- name: Install Black
	run: pip install black
	- name: Run black --check .
	run: black --check .

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