Latest version of com.typesafe.akka:akka-protobuf-v3_2.12
https://javadoc.io/doc/com.typesafe.akka/akka-protobuf-v3_2.12
Current version 2.9.0-M1
https://javadoc.io/doc/com.typesafe.akka/akka-protobuf-v3_2.12/2.9.0-M1
package-list path (used for javadoc generation -link option)
https://javadoc.io/doc/com.typesafe.akka/akka-protobuf-v3_2.12/2.9.0-M1/package-list