Update release workflow to use latest Ubuntu instead of 18.04 #75

	name: Lint with flake8
	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]

	jobs:
	lint:
	runs-on: ubuntu-latest
	env:
	PRE_COMMIT_HOME: ${{ github.workspace }}/pre-commit-cache
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python
	id: python
	uses: actions/setup-python@v2
	with:
	python-version: '3.8'
	- name: Restore pre-commit environment
	uses: actions/cache@v2
	with:
	path: ${{ env.PRE_COMMIT_HOME }}
	key: "${{ runner.os }}-\
	precommit-\
	${{ steps.python.outputs.python-version }}-\
	${{ hashFiles('.pre-commit-config.yaml') }}"
	- name: Install flake8 and plugins from setup.py
	run: \|
	python -m pip install --upgrade pip
	pip install .[dev]
	- name: Run pre-commit hooks
	run: pre-commit run --all-files

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