add support for PHP 8 #71

	name: PHPUnit unit tests

	on:
	pull_request:
	push:

	jobs:
	phpunit:
	name: PHPUnit tests

	runs-on: ${{ matrix.operating-system }}

	strategy:
	matrix:
	operating-system:
	- ubuntu-latest
	php-version:
	- 7.4
	- 8.0
	- 8.1
	- 8.2

	steps:
	- name: Checkout
	uses: actions/checkout@v2

	- name: Install PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php-version }}
	ini-values: memory_limit=-1, max_execution_time=120
	tools: composer:v2

	- name: Get composer cache directory
	id: composer-cache
	run: echo "::set-output name=dir::$(composer config cache-files-dir)"
	- name: Cache dependencies
	uses: actions/cache@v2
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
	restore-keys: ${{ runner.os }}-composer-

	- name: Install dependencies
	run: composer install --prefer-dist --no-interaction --no-progress --no-suggest

	- name: Tests
	run: vendor/bin/phpunit --testdox --colors=always --no-interaction --verbose

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