Updates and fixes for project configuration #38

	name: Continuous Integration
	on: [push]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	php-versions: [
	'7.1',
	'7.2',
	'7.3',
	'7.4',
	'8.0',
	'8.1',
	]

	steps:
	- uses: actions/checkout@v2

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

	- name: Analysing source code
	run: find ./src/ ./inc/ ./tests/ -type f -name '*.php' -print0 \| xargs -0 -L 1 -P 4 -- php -l

	- name: Validate composer.json and composer.lock
	run: composer validate

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

	- name: PhpUnit
	run: ./vendor/bin/phpunit

	- name: Psalm
	run: ./vendor/bin/psalm --show-info=false --threads=8 --diff

	- name: PHPCS
	run: ./vendor/bin/phpcs -s --report-source --runtime-set ignore_warnings_on_exit 1

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