(Re-)add support for psr/http-message version 1.0 #84

	name: Build

	on:
	push:
	branches: [master]
	pull_request:

	jobs:
	tests:
	services:
	mailhog:
	image: mailhog/mailhog:v1.0.0
	env:
	MH_SMTP_BIND_ADDR: 0.0.0.0:2025
	MH_API_BIND_ADDR: 0.0.0.0:9025
	MH_UI_BIND_ADDR: 0.0.0.0:9025
	ports:
	- 2025:2025
	- 9025:9025
	runs-on: ubuntu-22.04
	name: Test
	strategy:
	fail-fast: false
	matrix:
	php: ["7.2", "7.3", "7.4", "8.0", "8.1", "8.2", "8.3"]
	composer-flags: ["", "--prefer-lowest"]
	env:
	COMPOSER_ROOT_VERSION: dev-master
	steps:
	- uses: actions/checkout@v2

	- name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: "${{ matrix.php }}"
	coverage: pcov

	- name: Install dependencies
	run: composer update ${{ matrix.composer-flags }}

	- name: "Install PHPUnit 10"
	run: composer require --dev phpunit/phpunit:^10.0 -W
	if: "${{ startsWith(matrix.php, '8.') }}"

	- name: Run tests
	run: make test

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