fix Checkbox background problem on iOS with RN 0.19
fix Checkbox background problem on iOS with RN 0.19

xinthink/react-native-material-kit,20matan/react-native-material-kit,20matan/react-native-material-kit,xinthink/react-native-material-kit,rtmruczek/react-native-material-kit,xinthink/react-native-material-kit,rtmruczek/react-native-material-kit,rtmruczek/react-native-material-kit,xinthink/react-native-material-kit,20matan/react-native-material-kit