Upgrade to latest Akka Version

[synox]

Akka 2.4.6 is is out, could you please update the artifacts?
Thanks a lot! 👍

[synox]

@lancearlaus Would it work to just bump up the akka version? Or do you expect that the code has to be changed as well?

[mjkrumlauf]

I have done so and will submit a pull request when ready.

[mjkrumlauf]

Done - see pull request #6