Updated button and icon elements. FIxed compilation bug

Update of the button and icon elements to use the properties of the latest version of the framework
Fixed a bug that caused an error when compiling the component within a project

Author: jcancig

LICENSE

@@ -2,10 +2,6 @@
 
 Highly customizable Ionic 5 component to display evaluations or a quick rating operation of something.  
 
-
-For Ionic 3 projects please check this package : https://www.npmjs.com/package/ionic3-star-rating
-
-For Ionic 4 projects please check this package : https://www.npmjs.com/package/ionic4-star-rating
 # How to use
 
 ## Step 1
@@ -412,14 +408,28 @@ export class SatisfactionSurveyPage  implements OnInit, OnDestroy {
     }
 
     ngOnInit() {
-        this.ionicRatingSubscriptionService.getStartRatingChangedObservable().subscribe(value => {
+        this.ionicRatingService.getStartRatingChangedObservable().subscribe(value => {
        
         });
     }
        
      ngOnDestroy() {
-        this.ionicRatingSubscriptionService.getStartRatingChangedObservable().unsubscribe();
+        this.ionicRatingService.getStartRatingChangedObservable().unsubscribe();
      }
 }
 ```
+## Build
+
+Run `ng build ionic-rating` to build the project. The build artifacts will be stored in the `dist/` directory.
+
+## Publishing
+
+After building your library with `ng build ionic-rating`, go to the dist folder `cd dist/ionic-rating` and run `npm publish`.
+
+## Running unit tests
+
+Run `ng test ionic-rating` to execute the unit tests via [Karma](https://karma-runner.github.io).
+
+## Further help
 
+To get more help on the Angular CLI use `ng help` or go check out the [Angular CLI README](https://github.com/angular/angular-cli/blob/master/README.md).