fix: remove alert dialog from module

example/lib/example_registration_repository.dart

@@ -5,8 +5,8 @@ import 'package:flutter_registration/flutter_registration.dart';
 
 class ExampleRegistrationRepository with RegistrationRepository {
   @override
-  Future<void> register(HashMap values) {
+  Future<bool> register(HashMap values) {
     debugPrint('register: $values');
-    return Future.value(null);
+    return Future.value(true);
   }
 }

lib/src/registration_screen.dart

@@ -14,34 +14,12 @@ class RegistrationScreen extends StatelessWidget {
   Widget build(BuildContext context) {
     var translations = registrationOptions.registrationTranslations;
 
-    void showError(String error) => showDialog<String>(
+    void register(values) =>
-          context: context,
+        registrationOptions.registrationRepository.register(values).then(
-          builder: (BuildContext context) => AlertDialog(
+          (response) {
-            content: Text(error),
+            if (response) {
-            actions: <Widget>[
+              registrationOptions.afterRegistration();
-              TextButton(
+            }
-                onPressed: () => Navigator.pop(
-                  context,
-                  translations.closeBtn,
-                ),
-                child: Text(
-                  translations.closeBtn,
-                ),
-              ),
-            ],
-          ),
-        );
-
-    void register(values) => registrationOptions.registrationRepository
-            .register(values)
-            .then(
-              (_) => registrationOptions.afterRegistration(),
-            )
-            .catchError(
-          (error) {
-            showError(
-              error.toString(),
-            );
           },
         );
 

lib/src/service/registration_repository.dart

@@ -1,5 +1,5 @@
 import 'dart:collection';
 
 mixin RegistrationRepository {
-  Future<void> register(HashMap values);
+  Future<bool> register(HashMap values);
 }