- #273: Added ability to include developer payload in updateSubscription() methods - @autonomousapps.
- #271: Converted single-element arraylist into singleton list - @autonomousapps.
- #252: Created new factory constructors that allow for late-init of play services - @autonomousapps.
- #224: Minor type for the function isOneTimePurchaseSupported() - @omerfarukyilmaz.
- #223: additional service availability checker - @MedetZhakupov.