Added basic auth middleware to PostmarkController

Author: davidrushton

src/Http/Controllers/PostmarkController.php

@@ -2,11 +2,17 @@
 
 namespace BeyondCode\Mailbox\Http\Controllers;
 
+use Illuminate\Routing\Controller;
 use BeyondCode\Mailbox\Facades\Mailbox;
 use BeyondCode\Mailbox\Http\Requests\PostmarkRequest;
 
-class PostmarkController
+class PostmarkController extends Controller
 {
+	public function __construct()
+    {
+        $this->middleware('laravel-mailbox');
+    }
+
     public function __invoke(PostmarkRequest $request)
     {
         Mailbox::callMailboxes($request->email());