⚡ update to laravel v8 (#8)

Signed-off-by: ssatz <[email protected]>

Author: ssatz

composer.json

@@ -14,7 +14,7 @@
     "require": {
         "json-mapper/json-mapper": "^1.0",
         "php": "^7.2 || ^8.0",
-        "illuminate/support": "^5.5|^6|^7"
+        "illuminate/support": "^5.5|^6|^7|^8"
     },
     "autoload": {
         "psr-4": {
@@ -44,6 +44,6 @@
         "phpstan/phpstan": "^0.12.19",
         "php-coveralls/php-coveralls": "^2.2",
         "phpunit/phpunit": "^8.0",
-        "orchestra/testbench": "^5.3"
+        "orchestra/testbench": "^5.3|^6.0"
     }
 }