updated install instructions #26

	name: Tox lint checking
	on:
	push:
	branches:
	- master
	pull_request:
	branches:
	- master
	jobs:
	build:
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v2
	- name: Install Python
	uses: actions/setup-python@v2
	with:
	python-version: 3.9.5
	- name: Install pipenv
	run: pip install pipenv==2021.5.29
	- id: cache-pipenv
	uses: actions/cache@v2
	with:
	path: ~/.local/share/virtualenvs
	key: ${{ runner.os }}-pipenv-${{ hashFiles('**/Pipfile.lock') }}
	- name: Install package
	if: steps.cache-pipenv.outputs.cache-hit != 'true'
	run: \|
	pipenv install --dev
	- name: Flake8
	run: pipenv run flake8 src
	- name: MyPy
	run: pipenv run mypy src

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