A time format props

[ecmadao]

#58

Maybe can add a new props like timeFormatter, or something like this, it can receive a string or a function. Then we can render time ui style by using this props, like timeFormatter={'HH:MM'} or timeFormatter={'HH : MM'} or even timeFormatter={(hour, minute) =>hour&minute}

[ecmadao]

New version v2.2.4 published, add timeFormat and timeFormatter props.