Change Key to be a unique instead of index

[cl-lior-rnd]

react-native-simple-radio-button/lib/SimpleRadioButton.js

Line 62 in 02fff78

key={i}

..\node_modules\react-native\Libraries\Core\ExceptionsManager.js:126 Warning: Each child in a list should have a unique "key" prop.

Check the render method of `RadioButtonBottomModal`. See https://fb.me/react-warning-keys for more information.
    in RadioButton (at RadioButtonBottomModal.js:50)
    in RadioButtonBottomModal (created by Field)
    in Field (at ImportFileScreen.js:209)
    in RCTView (at ImportFileScreen.js:178)
    in RCTView (at ScrollView.js:1041)
    in RCTScrollView (at ScrollView.js:1181)
    in ScrollView (at ImportFileScreen.js:174)
    in Formik (at ImportFileScreen.js:168)
    in RCTView (at SafeAreaView.js:40)
    in SafeAreaView (at ImportFileScreen.js:167)
    in ImportFileScreen (at SceneView.js:9)
    in SceneView (at SwitchView.js:12)
    in SwitchView (at createNavigator.js:80)
    in Navigator (at createAppContainer.js:430)
    in NavigationContainer (at App.js:43)
    in ApolloProvider (at App.js:41)
    in AppContainer (at renderApplication.js:40)
    in RCTView (at AppContainer.js:101)
    in RCTView (at AppContainer.js:119)
    in AppContainer (at renderApplication.js:39)