added offline owner support

plugins/advancedoregen.md

@@ -101,6 +101,12 @@ By default, the player is handled as AFK after 20 minutes. Keep in mind that you
 
 ![](https://github.com/mastercake10/wiki/raw/master/uploads/afk-generator-example.png)
 
+### Offline owner support
+
+AdvancedOreGen caches the player permissions for keeping the same cobblestone generator after an owner of an island leaves the server. You can see an example here:
+
+[filename](_media/offline-owner-showcase.mp4 ':include :type=video')
+
 # Commands
 
 There're some commands for managing and editing different generators, but as already said, you can purely use the GUI!