Update README.md (#533) #649

	name: lint

	on: [push, pull_request]

	jobs:
	lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.7
	uses: actions/setup-python@v2
	with:
	python-version: 3.7
	- name: Install pre-commit hook
	run: \|
	pwd&&ls
	pip install pre-commit
	pre-commit --version
	- name: pre-commit checking
	run: \|
	git fetch
	git branch -a
	git diff --name-status remotes/origin/master HEAD
	updated_files=`git diff --name-status remotes/origin/master HEAD\|awk '{print$ 2}'`
	echo $updated_files
	for file in $updated_files
	do
	if [ "${file##*.}" = "py" ]; then
	echo $file
	pre-commit run --files $file --show-diff-on-failure
	fi
	done

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