Calquito

Based on https://github.com/klyngbaek/accurate-interval/blob/master/index.js i modified index.js to create this more accurate countdown: [accurate-countdown.zip](https://github.com/talalmajali/react-native-countdown-component/files/6816875/accurate-countdown.zip) I have not measured its accuracy thoroughly, but it seems to have an uncertainty of miliseconds, a...