Introduce `ClientStates` enumeration #39

	name: Check
	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- "*"
	jobs:
	format:
	runs-on: ubuntu-latest
	name: Format
	steps:
	- name: Check out repository
	uses: actions/checkout@v3

	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: "3.8"

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install pipenv
	pipenv install --dev

	- name: Run format check
	run: \|
	pipenv run yapf --diff --recursive .

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