TransactWriteItems throws UnknownOperationException

[sam-goodwin]

It looks like DynamoDB's transactional operations are not supported? When I attempt to call TransactWriteItems, the AWS SDK throws UnknownOperationException.

Is this a known issue? Any plan to implement?

Related notice for DynamoDB Local: https://aws.amazon.com/about-aws/whats-new/2019/02/amazon-dynamodb-local-adds-support-for-transactional-apis-on-demand-capacity-mode-and-20-gsis/

[bwitt]

hi this is a dupe of #98 ; there's a current open PR at #143