Add 'Accept-Ranges' header to the asset responses (needed for video s…

…crubbing).

src/App/Assets.php

@@ -412,6 +412,7 @@ public function getResponse(\BearFramework\App\Request $request): ?\BearFramewor
                 $response->headers->set($response->headers->make('Content-Type', $mimeType));
             }
             $response->headers->set($response->headers->make('Content-Length', (string) filesize($filename)));
+            $response->headers->set($response->headers->make('Accept-Ranges', 'bytes'));
             return $response;
         }
     }