fix func 'randomColor' in DefaultMarkers.js (#2799)
fix func 'randomColor' in DefaultMarkers.js (#2799)


wannyk/react-native-maps,lelandrichardson/react-native-maps,lelandrichardson/react-native-maps,wannyk/react-native-maps,wannyk/react-native-maps,wannyk/react-native-maps,lelandrichardson/react-native-maps