[fix] ActivtyIndicator accessibility props

Markup the 'ActivityIndicator' as an indeterminate ARIA 'progressbar'

src/components/ActivityIndicator/index.js

@@ -81,11 +81,16 @@ class ActivityIndicator extends Component {
     );
 
     return (
-      <View {...other} style={[
+      <View {...other}
-        styles.container,
+        accessibilityRole='progressbar'
-        style,
+        aria-valuemax='1'
-        size && { height: size, width: size }
+        aria-valuemin='0'
-      ]}>
+        style={[
+          styles.container,
+          style,
+          size && { height: size, width: size }
+        ]}
+      >
         <Animated.View
           children={svg}
           style={[