message: Implement Send for Api types
diff: @@ -31,7 +31,7 @@ pub trait Storage: ReadonlyStorage {
  //
  // We should consider if there is a way for modules to opt-in to only a subset of these
  // Api for backwards compatibility in systems that don't have them all.
  -pub trait Api: Copy + Clone {
  +pub trait Api: Copy + Clone + Send {
  fn canonical_address(&self, human: &HumanAddr) -> Result<CanonicalAddr>;
  fn human_address(&self, canonical: &CanonicalAddr) -> Result<HumanAddr>;
  }
  