Added Auto-Discovery feature to work with Laravel 5.5

Author: luiztessadri

composer.json

@@ -34,5 +34,16 @@
         ]
     },
     "minimum-stability": "dev",
-    "prefer-stable": true
+    "prefer-stable": true,
+    "extra": {
+        "laravel": {
+            "providers": [
+                "LaravelFCM\FCMServiceProvider"
+            ],
+            "aliases": {
+                "FCM" : "LaravelFCM\Facades\FCM"
+                "FCMGroup" : "LaravelFCM\Facades\FCMGroup"
+            }
+        }
+    }
 }