Update composer.json

Author: Observer5

composer.json

@@ -2,7 +2,7 @@
     "name": "observer/laravel-pdd",
     "description": "pdd SDK for Laravel",
     "require": {
-        "illuminate/container": "^5.1",
+        "illuminate/container": "^6.0|^7.0|^8.0",
         "observer/pdd": "^1.0.0"
     },
     "license": "MIT",