Add imghdr to build docs on Python 3.13 #24

	name: lint-test-build

	on: [push]

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "pypy3.8", "pypy3.9", "pypy3.10", "pypy3.11"]

	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -e .[dev]
	- name: Lint with pylint
	run: \|
	python -m pylint polyline
	- name: Test with pytest
	run: \|
	python -m pytest
	- name: Build docs
	run: \|
	python -m sphinx.cmd.build -b html docs docs/_build/html

Provide feedback