add pip cache for github action #44

	name: Publish to PyPI
	on: push
	jobs:
	build-n-publish:
	name: Build, test and publish Python 🐍 distributions 📦 to PyPI
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@master
	with:
	fetch-depth: 5
	- name: Set up Python
	uses: actions/setup-python@v1
	with:
	python-version: 3.8
	cache: 'pip'
	- name: Install requirements
	run: \|
	pip3 install -e .
	pip3 install pytest coverage
	- name: Run UnitTest
	run: \|
	python3 -m coverage run -m pytest -vv tests/
	python3 -m coverage xml --include "wdapy/**"
	- name: Install pypa/build and Build targz and wheel
	run: \|
	python3 -m pip install wheel
	python3 setup.py sdist bdist_wheel
	- name: Publish distribution 📦 to PyPI
	if: startsWith(github.ref, 'refs/tags')
	uses: pypa/gh-action-pypi-publish@master
	with:
	skip_existing: true
	password: ${{ secrets.PYPI_API_TOKEN }}
	# coverage:
	# runs-on: ubuntu-latest
	# steps:
	# - name: Get Cover
	# uses: orgoro/coverage@v3
	# with:
	# coverageFile: coverage.xml
	# token: ${{ secrets.GORELEASER_GITHUB_TOKEN }}

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