Add "Modernizing Superseded Typing Features" guide #412

	name: Build the documentation

	on:
	pull_request:

	permissions:
	contents: read

	jobs:
	build:

	name: Build documentation
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.9
	- name: Install dependencies
	run: \|
	pip install --upgrade pip
	pip install -r docs/requirements.txt
	- name: Build the documentation
	run: make -C docs html

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