Merge pull request #16 from bomas13/add_laravel_5.6+_support

Add basic Laravel 5.6+ support

src/Graylog2ServiceProvider.php

@@ -2,7 +2,6 @@
 
 namespace Swis\Graylog2;
 
-use Illuminate\Support\Facades\Log;
 use Illuminate\Support\ServiceProvider;
 
 class Graylog2ServiceProvider extends ServiceProvider
@@ -18,7 +17,7 @@ public function boot()
         ]);
 
         // Register handler
-        $monoLog = Log::getMonolog();
+        $monoLog = $this->getMonolog();
         $monoLog->pushHandler(new Graylog2Handler(config('graylog2.log_level', 'debug')));
     }
 
@@ -29,4 +28,14 @@ public function register()
     {
         $this->app->singleton('graylog2', Graylog2::class);
     }
+
+    /**
+     * @return \Monolog\Logger
+     */
+    private function getMonolog()
+    {
+        return $this->app['log'] instanceof \Illuminate\Log\LogManager
+            ? $this->app['log']->driver()
+            : $this->app['log']->getMonolog();
+    }
 }