Fixed formatting of filter_multi_output() docstring. #87

	name: CI
	on:
	- push
	- pull_request
	jobs:
	test:
	runs-on: ubuntu-20.04
	strategy:
	fail-fast: false
	matrix:
	python-version:
	- "2.7"
	- "3.5"
	- "3.6"
	- "3.7"
	- "3.8"
	- "3.9"
	- "3.10"
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install ffmpeg
	run: \|
	sudo apt update
	sudo apt install ffmpeg
	- name: Setup pip + tox
	run: \|
	python -m pip install --upgrade \
	"pip==20.3.4; python_version < '3.6'" \
	"pip==21.3.1; python_version >= '3.6'"
	python -m pip install tox==3.24.5 tox-gh-actions==2.9.1
	- name: Test with tox
	run: tox
	black:
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v3
	- name: Black
	run: \|
	# TODO: use standard `psf/black` action after dropping Python 2 support.
	pip install black==21.12b0 click==8.0.2 # https://stackoverflow.com/questions/71673404
	black ffmpeg --check --color --diff

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