Number format for floats (prevent scientific notation)

[GDmac]

Some actions to fetch content in my app are fast (local vs remote).
And for fast actions since_last_mark returns something like 8.345e7.
i have added a number_format to force 5 decimals after
https://github.com/veloper/Bench/blob/master/class.Bench.php#L119

$mark['since_last_mark'] = number_format($mark['since_last_mark'], 5);