bump php version requirement to 7.0 and add types on all methods #12

	name: PHP

	on: [ push, pull_request ]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	php-versions: [ '7.3', '7.4', '8.0', '8.1', '8.2', '8.3' ]

	steps:
	- uses: actions/checkout@v2

	- uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php-versions }}
	tools: composer

	- 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@v2
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
	restore-keys: ${{ runner.os }}-composer-

	- name: Install dependencies
	if: steps.composer-cache.outputs.cache-hit != 'true'
	run: composer install --prefer-dist --no-progress

	- name: Run test suite
	run: composer run-script test

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