add sign_xml and to_pdf utility methods #153

	name: tests

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]
	schedule:
	- cron: '0 5 * * 2'

	jobs:
	tests:
	name: ${{ matrix.name }}
	runs-on: ${{ matrix.os }}-latest
	strategy:
	fail-fast: false
	matrix:
	include:
	- {name: Python 3.7, python: 3.7, os: ubuntu}
	- {name: Python 3.8, python: 3.8, os: ubuntu}
	- {name: Python 3.9, python: 3.9-dev, os: ubuntu}
	- {name: Python 3.10, python: 3.10.0-beta - 3.10, os: ubuntu}
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python ${{ matrix.python }}
	uses: actions/setup-python@v2
	with:
	python-version: ${{ matrix.python }}
	- name: Install libxml2
	if: startsWith(matrix.python, 'pypy') \|\| startsWith(matrix.python, '3.10')
	run: \|
	sudo apt-get install libxml2-dev libxslt-dev
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip setuptools tox
	- name: Test
	run: \|
	tox -e py -v --color=yes
	- name: Upload coverage reports to Codecov
	uses: codecov/codecov-action@v3

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