Add python upgrade instructions to README #145

	name: Lint Files

	on:
	push:
	branches:
	- "*"
	pull_request:
	branches:
	- main

	jobs:
	lint:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3
	- name: setup Python 3.9
	uses: actions/setup-python@v4
	with:
	python-version: "3.9"
	- name: install Poetry
	uses: snok/[email protected]
	- name: install dependencies
	run: poetry install
	- name: flake8 check
	run: poetry run flake8 .
	- name: black check
	run: poetry run black --check --diff .
	- name: Yaml file linting
	run: \|
	docker run --rm \
	-v $(pwd):/code \
	registry.gitlab.com/pipeline-components/yamllint:latest -s .

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