Add first_day and last_day #49

	name: CI
	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- "*"
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version:
	- "3.7"
	- "3.8"
	- "3.9"
	- "3.10"
	- "3.11"
	- "3.12"
	steps:
	- uses: actions/checkout@v3
	- name: Install poetry
	run: pipx install poetry
	- uses: actions/setup-python@v4
	name: Set up Python ${{ matrix.python-version }}
	with:
	python-version: ${{ matrix.python-version }}
	cache: "poetry"
	- name: Install the project dependencies
	run: poetry install
	- name: Run tests
	run: poetry run pytest -v

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