Include google's Timestamp

[FadyQJ]

I don't know if I am missing something but I can't seem to make it work I have

Cargo.toml

[dependencies]
prost = { version = "0.13.3" }
prost-types = { version = "0.13.3" }

[build-dependencies]
prost-build = { version = "0.13.3" }

test.proto

syntax = "proto3";

package test;

import "google/protobuf/timestamp.proto";

message ...

build.rs

fn main() {
    prost_build::Config::new()
        .extern_path(".google.protobuf", "::prost_types")
        .compile_protos(
            &[
                "proto/test.proto",
            ],
            &["proto/"]
        ).unwrap();
}

While building I always get

thread 'main' panicked at models\build.rs:13:11:
called `Result::unwrap()` on an `Err` value: Custom { kind: Other, error: "protoc failed: google/protobuf/timestamp.proto: File not found.\r\test.proto:5:1: Import \"google/protobuf/timestamp.proto\" was not found or had errors.\r\test.proto:17:12: \"google.protobuf.Timestamp\" is not defined.\r\n" }