add typing-extensions in github workflows #53

	name: utype CI Workflow
	# run before every pull request and every push
	on:
	pull_request:
	paths-ignore:
	- 'docs/**'
	- 'examples/**'
	- '**/README.md'
	push:
	paths-ignore:
	- 'docs/**'
	- 'examples/**'
	- '**/README.md'

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	max-parallel: 3
	matrix:
	python-version: ['3.7', '3.9', '3.11']
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install flake8 pytest pytest-cov pytest-asyncio
	pip install typing-extensions>=4.1.0
	- name: Run lint
	run: \|
	flake8 utype --count --select=E9,F63,F7,F82 --show-source --statistics
	- name: Run tests
	run: \|
	pytest --cov=utype
	- name: Upload coverage reports to Codecov
	uses: codecov/codecov-action@v3
	# run: \|
	# curl -Os https://uploader.codecov.io/latest/linux/codecov
	# chmod +x codecov
	# ./codecov -t ${CODECOV_TOKEN}

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