Benchmarking uutils/coreutils' factor too

bench.sh

#!/bin/bash
set -euo pipefail

echo "Commit id,Commit message,Mean (s),σ (s),Median (s),User (s),System (s),Min (s),Max (s)" > table.csv

for rev in $(git rev-list --reverse master..); do
    git checkout "$rev"
    cargo build --release
    hyperfine --export-csv table.tmp.csv "seq 2 $((10 ** 7)) | ../../../target/release/factor > /dev/null"
    { echo -n "$(git show -q --format='%h,%s,')"; tail -n1 table.tmp.csv | cut -d, -f 2-; } >> table.csv
    rm table.tmp.csv
done