Function intspan::read_first_column

pub fn read_first_column(input: &str) -> Vec<String>

let sizes = intspan::read_first_column("tests/spanr/S288c.chr.sizes");
assert_eq!(sizes.len(), 16);
assert_eq!(*sizes.get(1).unwrap(), "II");
assert_eq!(*sizes.get(15).unwrap(), "XVI");