update pckg metadata, add minimal test with np<2 #71

	name: Check Build

	on: [push, pull_request]

	jobs:
	check-build:
	name: Check Build
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@master
	- name: Set up Python 3.9
	uses: actions/setup-python@v1
	with:
	python-version: 3.9
	- name: Install check-build dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install --user build twine
	- name: Build source tarball
	run: python -m build --sdist --outdir dist/ .
	- name: Check with twine
	run: twine check dist/*

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