Update README.md

ionic rollup related issue workaround is no longer needed.

Author: andrucz

README.md

@@ -18,7 +18,7 @@ $ npm install --save ionic2-rating
 ```
 
 ```Typescript
-import { Ionic2RatingModule } from 'ionic2-rating/module';
+import { Ionic2RatingModule } from 'ionic2-rating';
 
 @NgModule({
   imports: [
@@ -28,8 +28,6 @@ import { Ionic2RatingModule } from 'ionic2-rating/module';
 export class AppModule {}
 ```
 
-Important: there is an open issue about the use of third party libraries on Ionic 2 RC.0 apps: https://github.com/driftyco/ionic/issues/8322
-
 ##### For Angular 2 RC4 (Ionic 2 beta version):
 
 ```