Add zeroPadLength for days

[lucasdeassis]

When using countdown, zeroPadLength is not applied for days as it's described in

This option defaults to 2 in order to display the common format 00:00:00 instead of 0:0:0. If the value is higher than 2, only the hour part (never days) will be zero-padded while it stays at 2 for minutes as well as seconds.

In my case, in order to pad days as well I had to do:

const renderer = ({
    days, hours, minutes, seconds,
  }) => (
    <span>
      {zeroPad(days, 2)}:{zeroPad(hours, 2)}:{zeroPad(minutes, 2)}:{zeroPad(seconds, 2)}
    </span>
  );

It would be great if we had a param for applying zeroPad in days as well, instead of having to define a renderer function just for that.

[ndresx]

This has been fixed with the latest release, thank you!