message: Use 2018 idioms
diff: @@ -204,7 +204,7 @@ pub fn move_to_s3(conn: &Connection, n: usize) -> Result<usize, Error> {
  )?;
  let count = rows.len();
  - let mut rt = ::tokio::runtime::Runtime::new().unwrap();
  + let mut rt = tokio::runtime::Runtime::new().unwrap();
  let mut futures = Vec::with_capacity(rows.len());
  for row in &rows {
  let path: String = row.get(0);
  