Changed parameter #2 of http_build_query to empty string on requestTokenExchange to support PHP8.x #232

	---
	name: build

	on: [push, pull_request]

	env:
	DEFAULT_COMPOSER_FLAGS: "--prefer-dist --no-interaction --no-progress --optimize-autoloader --ansi"

	jobs:
	phpunit:
	name: PHP ${{ matrix.php }} on ${{ matrix.os }}
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-latest]
	php: ['7.0', '7.1', '7.2', '7.3', '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: ${{ matrix.php }}
	- name: Get composer cache directory
	id: composer-cache
	run: echo "::set-output name=dir::$(composer config cache-files-dir)"
	- name: Cache composer dependencies
	uses: actions/cache@v1
	with:
	path: ${{ steps.composer-cache.outputs.dir }}
	key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
	restore-keys: ${{ runner.os }}-composer-
	- name: Install dependencies
	run: composer update $DEFAULT_COMPOSER_FLAGS
	- name: Run unit tests
	run: vendor/bin/phpunit --verbose --colors=always tests

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