Fix bug when using selectedDate. (#69)
Fix bug when using selectedDate. (#69)

When using selectedDate it renders and highlights the date for current Month, but when we ```Press``` or ```Swipe``` to the ```Next``` or ```Prev``` month, the selectedDate doesn't get highlighted.

So, this commit fixes this bug.
christopherdro/react-native-calendar,samcorcos/react-native-calendar,samcorcos/react-native-calendar,hyb175/react-native-calendar,samcorcos/react-native-calendar,hyb175/react-native-calendar,christopherdro/react-native-calendar,christopherdro/react-native-calendar,hyb175/react-native-calendar