fix nested referencing #90

	name: build

	on: [push]

	jobs:
	build:
	runs-on: ${{ matrix.os }}

	strategy:
	matrix:
	os: [ubuntu-latest]

	env:
	OS: ${{ matrix.os }}
	PYTHON: '3.9'

	steps:

	- uses: actions/checkout@v1

	- name: Set up Python
	uses: actions/setup-python@master
	with:
	python-version: 3.9

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install .

	- name: Test and generate coverage report
	run: \|
	python -m pip install pytest
	python -m pip install pytest-cov
	pytest --cov=./ --cov-report=xml

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