fixed require ReactPropTypes bug
fixed require ReactPropTypes bug

Fixed error: `Unable to resolve module ReactPropTypes from /XXX. Invalid directory XX/node_modules/ReactPropTypes`
christopherdro/react-native-calendar,samcorcos/react-native-calendar,samcorcos/react-native-calendar,christopherdro/react-native-calendar,hyb175/react-native-calendar,hyb175/react-native-calendar,hyb175/react-native-calendar,samcorcos/react-native-calendar,christopherdro/react-native-calendar