Options filter (for limit by custom capability, for example)

Just letting you know that I forked the plugin and added a filter to let an administrator to change, for example, the required capability to be a custom capability. I think it would be a good idea to add this filter on future official versions.

Check it on:

https://github.com/2aces/post-types-order/blob/restrict-by-user-capability/include/functions.php

Best regards