Laravel 8 support

Author: driesvints

Diff for: composer.json

@@ -15,10 +15,10 @@
     ],
     "require": {
         "php": ">=7.1.3",
-        "illuminate/support": "~5.8.0|^6.0|^7.0"
+        "illuminate/support": "~5.8.0|^6.0|^7.0|^8.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.0"
+        "phpunit/phpunit": "^7.0|^8.0|^9.0"
     },
     "autoload": {
         "files": [
@@ -32,7 +32,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.0-dev"
+            "dev-master": "1.x-dev"
         }
     },
     "config": {