AWS SDK for iOS 2.6.23

Enhancements

• Amazon S3
  • Added enhancements to TransferUtility to resume transfers after app restart, convenience methods for status, completion handler and status tracking. See issue#489, issue#755, issue#759, and issue#769

Bug Fixes

• AWS IoT
  • Fixed bugs in AWS IoT reconnection logic. See issue#965, issue#968, and issue#972