update versioneer to 0.29, fixes #437 #334

	name: Linters

	on:
	- push
	- pull_request

	jobs:
	lint:
	runs-on: ubuntu-latest

	steps:
	- name: Set up environment
	uses: actions/checkout@v1
	with: # no need for the history
	fetch-depth: 1
	- name: Set up Python
	uses: actions/setup-python@v1
	with:
	python-version: '3.7'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install --upgrade tox
	- name: Run linters
	run: \|
	tox -e lint

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