use mamba-org/setup-micromamba for CI tests #71

	name: Lint (Flake8)
	on:
	push:
	paths-ignore:
	- 'README.md'
	pull_request:
	types:
	- opened
	paths-ignore:
	- 'README.md'
	jobs:
	build:

	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-18.04, ubuntu-20.04, macos-latest]
	python-version: [3.8, 3.9]

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v1
	with:
	python-version: ${{ matrix.python-version }}
	- name: Display Python version
	run: python -c "import sys; print(sys.version)"
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install --ignore-installed .
	- name: Lint with flake8
	run: \|
	pip install flake8
	# 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=240 --statistics

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