fix bug with invokables

Author: taylorotwell

src/Illuminate/Console/Scheduling/CallbackEvent.php

@@ -71,7 +71,9 @@ public function run(Container $container)
         parent::callBeforeCallbacks($container);
 
         try {
-            $response = $container->call($this->callback, $this->parameters);
+            $response = is_object($this->callback)
+                        ? $container->call([$this->callback, '__invoke'], $this->parameters)
+                        : $container->call($this->callback, $this->parameters);
         } finally {
             $this->removeMutex();