Update composer.json

Add support for Laravel 8

Author: DariusIII

composer.json

@@ -11,7 +11,7 @@
  ],
  "require": {
  "php": ">=7.2.0",
- "illuminate/support": "^6.0 || ^7.0"
+ "illuminate/support": "^6.0 || ^7.0 || ^8.0"
  },
  "autoload": {
  "psr-4": {
@@ -24,7 +24,7 @@
  "minimum-stability": "dev",
  "prefer-stable": true,
  "require-dev": {
- "phpunit/phpunit": "^7.0 || ^8.0",
+ "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0",
  "fzaninotto/faker": "^1.9",
  "mockery/mockery": "^1.3",
  "satooshi/php-coveralls": "^2.0",