Remove final parameter to make it compatible with both yaml versions, 2.x and 3.x

src/Handler.php

@@ -184,7 +184,7 @@ class Handler {
           'name' => $options['projectname'] . '_default',
         ],
       ];
-      file_put_contents($traefikFile, Yaml::dump($traefik, 9, 2, YAML::DUMP_MULTI_LINE_LITERAL_BLOCK));
+      file_put_contents($traefikFile, Yaml::dump($traefik, 9, 2));
       exec('docker-compose -f ' . $traefikFile . ' --project-name traefik restart');
     }