Add testing and support for 3.11 and 3.12 #28

	name: uniondiff
	on:
	push:
	branches:
	- "**"
	jobs:
	python-versions:
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dev deps
	run: python -m pip install -r requirements-dev.txt
	- name: Lint
	run: make lint
	- name: Test
	run: make test

	platforms:
	strategy:
	fail-fast: false
	matrix:
	platform: [macos-latest, windows-latest] # ubuntu-latest already covered
	runs-on: ${{ matrix.platform }}
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: 3.12
	- name: Install dev deps
	run: python -m pip install -r requirements-dev.txt
	- name: Test
	run: make test

Provide feedback