message: Use full hash when printing digest in `TraceID`
diff: @@ -23,7 +23,7 @@ struct TraceId<'a>(&'a [u8]);
  impl<'a> Display for TraceId<'a> {
  fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
  - write!(f, "{}", hash::hash(self.0))
  + write!(f, "{:x}", hash::hash(self.0))
  }
  }
  