Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows #6

	name: 'Build the software'

	on:
	push:
	branches:
	- master
	pull_request:
	branches:
	- master

	jobs:
	build:
	strategy:
	matrix:
	os: [ ubuntu-latest ]
	runs-on: ${{ matrix.os }}
	name: 'Build for ${{ matrix.os }}'
	steps:
	- name: 'Checkout code'
	uses: actions/checkout@v2
	- uses: actions/setup-python@v2
	with:
	python-version: '3.x'
	architecture: 'x64'
	- name: 'Build library egg'
	run: \|
	sudo apt-get update
	sudo apt-get install -y libeigen3-dev
	cd python
	python setup.py install --user
	- name: 'Run tests'
	run: \|
	pip install --user pytest numpy matplotlib
	python -m pytest tests/test_CE.py
	python -m pytest tests/test_EC.py
	python -m pytest tests/test_Ei.py
	python -m pytest tests/test_Er.py

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