complete all STPPromises on the main thread
complete all STPPromises on the main thread

stripe/stripe-ios,stripe/stripe-ios,stripe/stripe-ios,NewAmsterdamLabs/stripe-ios,fbernardo/stripe-ios,fbernardo/stripe-ios,stripe/stripe-ios,NewAmsterdamLabs/stripe-ios,fbernardo/stripe-ios,stripe/stripe-ios,NewAmsterdamLabs/stripe-ios,fbernardo/stripe-ios,NewAmsterdamLabs/stripe-ios,stripe/stripe-ios