KinesisGetRecords error in ScanShard doesn't wrap error if not retryable

[AndreyPiterkin]

In ScanShard, if an error is encountered during the Kinesis GetRecords call here: https://github.com/harlow/kinesis-consumer/blob/master/consumer.go#L194-L196

and the error is !isRetriable(err), the error format string grabs the value of the error instead of wrapping it with %w.

This is problematic for my use case, as it is possible that context.CancelFunc is called during the GetRecords call (however unlikely), and I need to check if errors.Is(err, context.Cancelled). Since it is not wrapped, it is impossible for me to tell whether this is the case.