Update markupsafe requirement from <3 to <4 #177

	name: Pylint
	on:
	pull_request:
	push:
	schedule:
	# first of each month
	- cron: '0 0 1 * *'
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.9
	uses: actions/setup-python@v2
	with:
	python-version: 3.9
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install pylint PyYAML Jinja2
	- name: Install make
	run: sudo apt-get install make
	- name: Analysing the code with pylint
	run: make pylint

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