useStopwatch API changes

[dlcastillop]

Before

const stopwatch = useStopwatch(0, 0, 10, 0, false, "-", () => console.log("Finish"))

Now

const stopwatch = useStopwatch({
    endTime: "00:00:10:00",
    startPaused: false,
    separator: "-",
    onFinish: () => console.log("Finish")
})