Update composer.json

Author: alasdairmackenzie

composer.json

@@ -11,9 +11,9 @@
     ],
     "require": {
 		"php": "^7.0",
-     	"guzzlehttp/guzzle": "~6.0",
-        "laravel/framework": "^5.5",
-        "laravel/passport": "^4.0|^5.0|^6.0|^7.0"
+     	"guzzlehttp/guzzle": ">=1.16.0",
+        "laravel/framework": ">=1.15.5",
+        "laravel/passport": "^4.0|^5.0|^6.0|^7.0|^8.0"
     },
     "autoload": {
         "psr-4": {"DesignMyNight\\Laravel\\OAuth2\\": "src/"}