Pew-kafka breaks with Alpakka 1.0 or later #66
Description
KafkaExecutor unit tests fail with akka-stream-kafka v1.0 or later. It does not even compile with v2.0 or above.
This means pew-kafka had been broken in versions 1.4 and 1.5 since e255b55.
We should update the implementation to use the latest stable version.