Make dynamoDBClient val public

[domenkosir]

Can you please make the dynamoDBClient val in ConcurrentBatchWriter.scala public, like in SingleThreadedBatchWriter.scala

I'd like to be able to configure the DynamoDB client specifically for my use case.

Thanks!

[mingchuno]

@domenkosir
I have forked this repo and published it under version 0.9.2
https://github.com/mingchuno/aws-wrap

This repo seems dead. I will impl the change and publish again. Stay tuned.

[mingchuno]

@domenkosir I have make chages in master of my repo: mingchuno@052ff81

Instead of making both client in ConcurrentBatchWriter & SingleThreadedBatchWriter, I change the constructor to incorporate client supplied ClientConfiguration so that client can have their config without leaking out internal client.

If CI is green light, I will publish a new version

[mingchuno]

@domenkosir done publish to jcenter with version 0.9.3