update polars-book-cn #63

	name: Polars User Guide code snippets

	on:
	- pull_request

	jobs:
	test:
	name: tests
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Setup Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.8

	- name: Install dependencies
	run: \|
	sudo apt-get update
	sudo apt-get install --no-install-recommends -y graphviz make wget
	python -m pip install black==22.3.0 mdformat==0.7.5

	- name: Check formatting
	run: \|
	black --check .
	mdformat --check $(find user_guide/src -name "*.md" \| grep -v SUMMARY.md)

	- name: Run snippets
	run: \|
	make run

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