Update Passport versions in composer.json

Author: robbytaylor

composer.json

@@ -13,7 +13,7 @@
 		"php": "^7.0",
      	"guzzlehttp/guzzle": "~6.0",
         "laravel/framework": "^5.5",
-        "laravel/passport": "^4.0"
+        "laravel/passport": "^4.0|^5.0|^6.0|^7.0"
     },
     "autoload": {
         "psr-4": {"DesignMyNight\\Laravel\\OAuth2\\": "src/"}