Update tox-workflow.yaml #19

	name: Tox
	on: [push, pull_request]

	jobs:
	linting:
	runs-on: ubuntu-latest
	name: Linting
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v1
	with:
	python-version: 3.7
	- name: Install Tox
	run: \|
	python -m pip install --upgrade pip
	pip install tox==4.0.19
	- name: Run Tox
	run: tox

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