Bump tox from 4.18.0 to 4.20.0 #168

	---
	name: Build test

	on: [push, pull_request]

	jobs:
	build:
	name: Main
	runs-on: ubuntu-latest

	steps:
	- name: Checkout branch
	uses: actions/checkout@v3

	- name: Set up Python and test
	uses: actions/setup-python@v4
	with:
	python-version: 3.9.13

	- name: Install Poetry
	run: pip install poetry==1.4.2

	- name: Cache Poetry virtualenv
	uses: actions/cache@v3
	id: cache
	with:
	path: ~/.virtualenvs
	key: poetry-$
	restore-keys: \|
	poetry-$
	- name: Install Python dependencies
	run: poetry install
	if: steps.cache.outputs.cache-hit != 'true'

	- name: Tests
	run: poetry run tox -e py

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