fix: Allow Button to work on react-native-web (#1433)

* docs(Button-0.19): Change fontSize type to number

* docs(Tile 0.19): Fix imageSrc to use correct requires

* docs(ListItem 0.19): Change ListView examples to use FlatList (#1401)

* changed ListView to FlatList

since ListView is deprecated it is not working properly or giving errors in newer versions of RN

* updated requested changes

Fixed changes required into FlatList

* docs(Card): Remove Lato fontFamily from examples (#1403)

People were getting errors copying and pasting these snippets since they
don't have Lato installed

* Fix Button On Web

TouchableNativeFeedback being used on web because Platform was not ios, but that component is not implemented in react-native-web

src/buttons/Button.js

@@ -155,7 +155,7 @@ Button.defaultProps = {
   title: 'Welcome to\nReact Native Elements',
   iconRight: false,
   TouchableComponent:
-    Platform.OS === 'ios' ? TouchableOpacity : TouchableNativeFeedback,
+    Platform.OS === 'android' ? TouchableNativeFeedback : TouchableOpacity,
   onPress: () => console.log('Please attach a method to this component'),
   clear: false,
   loadingProps: {