Add `to_list()` analogous to `to_tree()` #142

	name: Run tests for all supported python versions

	on: [push, pull_request, workflow_dispatch]

	jobs:
	build:
	runs-on: ubuntu-20.04
	strategy:
	matrix:
	python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	cache: 'pip'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install tox tox-gh-actions
	- name: Run tests
	run: tox

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