Add lint version pins - update gh wf #67

	name: zpretty
	on: [push]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: [3.8]

	steps:
	# git checkout
	- uses: actions/checkout@v2

	# python setup
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v1
	with:
	python-version: ${{ matrix.python-version }}

	# install zpretty
	- name: install zpretty
	run: pip install -c constraints.txt zpretty

	# run zpretty
	- name: run zpretty
	run: find eea/ -name *.zcml \| xargs zpretty -i

	# run git diff
	- name: run git diff
	run: git diff --exit-code

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