Explicit namespace root for \Exception

Without the slash, running `php artisan laravel-log-keeper` with no configuration results in the following exception being raised:
[Symfony\Component\Debug\Exception\FatalErrorException]          
Class 'MathiasGrimm\LaravelLogKeeper\Repos\Exception' not found

src/Repos/RemoteLogsRepo.php

@@ -15,7 +15,7 @@ public function __construct(array $config)
         $this->config = $config;
 
         if ($this->config['enabled_remote'] && !$this->config['remote_disk']) {
-            throw new Exception("remote_disk not configured for Laravel Log Keeper");
+            throw new \Exception("remote_disk not configured for Laravel Log Keeper");
         }
 
         $this->localLogPath = storage_path('logs');
@@ -65,4 +65,4 @@ public function get($log)
     {
         return $this->disk->get("{$this->remotePath}/{$log}");
     }
-}
+}