fix example in README.md #86

	name: Pytest with Docker
	# workflow triggered by any push on any branch
	on: [push]
	jobs:
	build:
	name: Pytest

	# runs within your Docker container
	container:
	image: ghcr.io/simonblanke/surfaces-testing-image:latest

	# runs on the latest Ubuntu
	runs-on: ubuntu-latest
	steps:
	# Lint code with flake8
	- name: Lint with flake8
	run: \|
	# stop the build if there are Python syntax errors or undefined names
	flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
	# exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
	flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics

	# checkout your code from your repository
	- name: Checkout source
	uses: actions/checkout@v2

	- name: Install package
	run: \|
	python -m pip install .

	# and runs pytest in your pipenv environment
	- name: Test with pytest
	run: \|
	python -m pytest tests --cov=surfaces --cov-report=term-missing --cov-report=xml -p no:warnings

	- name: Coverage Summary Report
	uses: irongut/[email protected]
	with:
	filename: coverage.xml
	badge: true

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