fix: Fix fallback prop not working. (#420)

src/__snapshots__/index.test.js.snap

@@ -52,7 +52,7 @@ exports[`Renders Image with fallback prop. 1`] = `
     ]
   }
 >
-  <FastImageView
+  <Image
     resizeMode="cover"
     source={
       Object {

src/index.js

@@ -40,7 +40,7 @@ class FastImage extends Component {
                     style={[styles.imageContainer, style]}
                     ref={this.captureRef}
                 >
-                    <FastImageView
+                    <Image
                         {...props}
                         style={StyleSheet.absoluteFill}
                         source={resolvedSource}