Expose `--host` for docker-compose support

[bebbi]

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If we have dynamodb-local running as a docker container and compose the services with docker-compose, we'd still like to use this package for the migrate functionality. However, in a docker-compose scenario, dynamodb-local runs on a separate host and for this to work, this package would need to expose a --host option.

Is this something you'd consider exposing?

[smdern]

Yes please