Improved Deduplication

[niemyjski]

We should update the client to be more in line with the .NET client and support submitting the deduped count.

https://github.com/exceptionless/Exceptionless.Net/releases/tag/v3.4.0

[srijken]

And set the date to the max of the dates of the rolled up events

[niemyjski]

How's this coming along?

[niemyjski]

@srijken closing this