No more double billing. (Subscriber Billing Mode) (Patreon)

 I've turned on Subscriber Billing Mode.

This allows new Patron Members to only be charged at the date when you subscribed. This should prevent the double billing situation as you will be charged the same date every month. 

Older Patron members who are already billed every 1st of each month, will not experience any change. Thank you so much for the support! :D