> compile

$ exists target/scala-2.12/pekko-grpc
$ exists target/scala-2.12/pekko-grpc/main/helloworld/HelloRequest.scala
$ exists target/scala-2.12/pekko-grpc/main/helloworld/HelloworldProto.scala
$ exists target/scala-2.12/pekko-grpc/main/helloworld/GreeterService.scala
