I created a widget and works well. However, when I install it, the version appears like "9999999-dev" in extensions.php:
  'host33/yii2-multilevel-vertical-menu' => 
  array (
    'name' => 'host33/yii2-multilevel-vertical-menu',
    'version' => '9999999-dev',
    'alias' => 
    array (
      '@host33/multilevelverticalmenu' => $vendorDir . '/host33/yii2-multilevel-vertical-menu',
    ),
  ),
What should I do?