message: Fix CE in Rust wrapper for metrics tests.
diff: +#[macro_use] extern crate serde_json;
  +#[macro_use] extern crate serde_derive;
  +extern crate rmp_serde;
  +extern crate byteorder;
  +extern crate futures;
  extern crate indyrs as indy;
  #[macro_use]
  use indy::metrics;
  