remove more six compatibility layer #30

	# This workflow will install Python dependencies and run tests with a variety of Python versions
	# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python

	name: Python package

	on:
	push:
	branches: [ "master" ]
	pull_request:
	branches: [ "master" ]

	jobs:
	build:

	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.8", "3.9", "3.10"]

	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip wheel build twine setuptools
	python -m pip install .

	- name: Test package format
	run: \|
	python -m build
	twine check dist/*

	- name: Test with unittest
	run: \|
	python test/test_litmus.py

Provide feedback