chore: change from default export to regular export

Author: Naturalclar

README.md

@@ -53,7 +53,7 @@ $ react-native link @react-native-community/progress-view
 ## Usage
 
 ```javascript
-import ProgressView from "@react-native-community/progress-view";
+import {ProgressView} from "@react-native-community/progress-view";
 ```
 
 ## Reference

index.js

@@ -1,6 +1 @@
-
-import { NativeModules } from 'react-native';
-
-const { RNCProgressView } = NativeModules;
-
-export default RNCProgressView;
+export {default as ProgressView} from './js/ProgressViewIOS';