docs: update README.md #28

	name: asyncify CI
	on: [push, pull_request]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	php: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2', '8.3', '8.4']
	name: PHP ${{ matrix.php }}
	steps:
	- uses: actions/checkout@v3
	- name: Install PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php }}
	extensions: parallel
	- name: Validate composer.json and composer.lock
	run: composer validate
	- name: Get Composer cache directory
	id: composer-cache
	run: echo "::set-output name=dir::$(composer config cache-files-dir)"
	- name: Cache dependencies
	uses: actions/cache@v3
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: ${{ matrix.php }}-composer-${{ hashFiles('**/composer.lock') }}
	restore-keys: ${{ matrix.php }}-composer-
	- name: Install dependencies
	run: composer install --prefer-dist --no-progress --no-suggest
	- name: Purge project of any phpunit cache files
	run: find . -name ".phpunit" -type f -print0 \| xargs -0 /bin/rm -f
	- name: Run test suite
	run: vendor/bin/phpunit

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