Add Laravel 5.5 Auto Discovery

Author: Jono20201

README.md

@@ -14,7 +14,7 @@ This package can be installed through Composer.
 composer require benwilkins/laravel-fcm-notification:@dev-master
 ```
 
-Once installed, add the service provider:
+If installing on < Laravel 5.5 then add the service provider:
 
 ```php
 // config/app.php

composer.json

@@ -15,5 +15,12 @@
     "psr-4": {
       "Benwilkins\\FCM\\": "src/"
     }
+  },
+  "extra": {
+    "laravel": {
+      "providers": [
+        "Benwilkins\\FCM\\FcmNotificationServiceProvider"
+      ]
+    }
   }
 }