Allow auto discover for Laravel 5.5

Author: Alexey Plekhanov

composer.json

@@ -14,8 +14,8 @@
     "require": {
         "php": ">=5.6.4",
         "guzzlehttp/guzzle": "^6.2",
-        "illuminate/notifications": "5.3.*|5.4.*",
-        "illuminate/support": "5.1.*|5.2.*|5.3.*|5.4.*"
+        "illuminate/notifications": "5.3.*|5.4.*|5.5.*",
+        "illuminate/support": "5.1.*|5.2.*|5.3.*|5.4.*|5.5.*"
     },
     "require-dev": {
         "mockery/mockery": "^0.9.5",
@@ -35,6 +35,14 @@
         "test": "vendor/bin/phpunit"
     },
     "config": {
+        "preferred-install": "dist",
         "sort-packages": true
+    },
+    "extra": {
+        "laravel": {
+            "providers": [
+                "NotificationChannels\\Pushbullet\\PushbulletServiceProvider"
+            ]
+        }
     }
 }