Update dependencies

Author: markwalet

composer.json

@@ -13,14 +13,14 @@
   ],
   "require": {
     "php": "^7.2",
-    "illuminate/contracts": "6.*|7.*",
-    "illuminate/support": "6.*|7.*",
+    "illuminate/contracts": "6.*|7.*|8.*",
+    "illuminate/support": "6.*|7.*|8.*",
     "spatie/packagist-api": "^2.0",
     "ext-json": "*"
   },
   "require-dev": {
     "phpunit/phpunit": "^8.5",
-    "orchestra/testbench": "4.*|5.*"
+    "orchestra/testbench": "4.*|5.*|6.*"
   },
   "autoload": {
     "psr-4": {