UnicodeProtobufEnumAttribute` is like `UnicodeEnumAttribute` but serializes into a Protobuf enum.
0.3.2
0.3.1
0.3.0
0.2.10
Adding `TimedeltaAttribute`, `TimedeltaMsAttribute` and `TimedeltaUsAttribute` which serialize `timedelta` objects into DynamoDB numbers as truncated integers (in seconds, milliseconds and microseconds respectively).