doc: add docstring to plugin class #1020

	name: Test
	on: push
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python 3.11.4
	uses: actions/setup-python@v4
	with:
	python-version: 3.11.4
	- name: Install dependencies
	run: \|
	wget https://github.com/jgm/pandoc/releases/download/2.19.2/pandoc-2.19.2-1-amd64.deb
	sudo dpkg -i pandoc-2.19.2-1-amd64.deb
	sudo apt-get install -f
	python -m pip install --upgrade pip setuptools
	pip install -e '.[dev]'
	npm install -g @mermaid-js/[email protected]
	mmdc --version

	- name: Run tests
	run: \|
	flake8 .
	pytest tests

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