Add `sound` property to APNSAlertNotificationContent#226

Myrronth wants to merge 1 commit intoswift-server-community:mainswift-server-community/APNSwift:mainfrom

Myrronth:improvements/Adds-sound-property-to-APNSAlertNotificationContent--Myrronth/APNSwift:improvements/Adds-sound-property-to-APNSAlertNotificationContent--Copy head branch name to clipboard