Latest version of com.typesafe.akka:akka-protobuf_3
https://javadoc.io/doc/com.typesafe.akka/akka-protobuf_3
Current version 2.6.18
https://javadoc.io/doc/com.typesafe.akka/akka-protobuf_3/2.6.18
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.typesafe.akka/akka-protobuf_3/2.6.18/package-list