added support for idempotency key #20

	name: Build and validate
	on: [ push ]

	jobs:
	tests:
	env:
	SECRET_KEY: ${{ secrets.SECRET_KEY }}
	name: Tests
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: [ 3.7, 3.9, 3.11 ]
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-python@v3
	with:
	python-version: ${{ matrix.python-version }}

	- name: Install dependencies
	run: python -m pip install --upgrade pip -r requirements.txt -r test_requirements.txt

	- name: Run tests
	run: pytest tests

	style-check:
	name: Style check
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-python@v3
	with:
	python-version: 3.11

	- name: Install dependencies
	run: python -m pip install --upgrade pip -r requirements.txt -r test_requirements.txt

	- name: Run style checks
	run: black --check setup.py shift4/ tests/

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