added Russian language to readme-md

 ![](https://raw.githubusercontent.com/jonataslaw/getx-community/master/get.png)
 
-*Idiomas: Español (este archivo), [Lengua china](README.zh-cn.md), [Inglés](README.md), [Portugués de Brasil](README.pt-br.md), [Polaco](README.pl.md).*
+*Idiomas: Español (este archivo), [Lengua china](README.zh-cn.md), [Inglés](README.md), [Portugués de Brasil](README.pt-br.md), [Russo](README-ru.md), [Polaco](README.pl.md).*
 
 [![pub package](https://img.shields.io/pub/v/get.svg?label=get&color=blue)](https://pub.dev/packages/get)
 ![building](https://github.com/jonataslaw/get/workflows/build/badge.svg)

 ![](https://raw.githubusercontent.com/jonataslaw/getx-community/master/get.png)
 
-_Languages: English (this file), [Chinese](README.zh-cn.md), [Brazilian Portuguese](README.pt-br.md), [Spanish](README-es.md),[Polish](README.pl.md)._
+_Languages: English (this file), [Chinese](README.zh-cn.md), [Brazilian Portuguese](README.pt-br.md), [Spanish](README-es.md), [Russian](README-ru.md), [Polish](README.pl.md)._
 
 [![pub package](https://img.shields.io/pub/v/get.svg?label=get&color=blue)](https://pub.dev/packages/get)
 ![building](https://github.com/jonataslaw/get/workflows/build/badge.svg)

 ![](https://raw.githubusercontent.com/jonataslaw/getx-community/master/get.png)
 
-*Languages: [English](README.md), [Język chiński](README.zh-cn.md), [Brazilian Portuguese](README.pt-br.md), [Spanish](README-es.md), Polish (Jesteś tu).*
+*Languages: [English](README.md), [Język chiński](README.zh-cn.md), [Brazilian Portuguese](README.pt-br.md), [Spanish](README-es.md), [Russian](README-ru.md),  Polish (Jesteś tu).*
 
 [![pub package](https://img.shields.io/pub/v/get.svg?label=get&color=blue)](https://pub.dev/packages/get)
 ![building](https://github.com/jonataslaw/get/workflows/build/badge.svg)

 ![](https://raw.githubusercontent.com/jonataslaw/getx-community/master/get.png)
 
-*Idiomas: [Inglês](README.md), [Língua chinesa](README.zh-cn.md), Português Brasileiro (este arquivo), [Espanhol](README-es.md), [Polaco](README.pl.md).*
+*Idiomas: [Inglês](README.md), [Chinês](README.zh-cn.md), Português Brasileiro (este arquivo), [Espanhol](README-es.md), [Russo](README-ru.md), [Polonês](README.pl.md).*
 
 [![pub package](https://img.shields.io/pub/v/get.svg?label=get&color=blue)](https://pub.dev/packages/get)
 ![building](https://github.com/jonataslaw/get/workflows/build/badge.svg)

 ![](https://raw.githubusercontent.com/jonataslaw/getx-community/master/get.png)
 
-_语言: 中文, [英文](README.md), [巴西葡萄牙语](README.pt-br.md), [西班牙语](README-es.md), [波兰语](README.pl.md)_
+_语言: 中文, [英文](README.md), [巴西葡萄牙语](README.pt-br.md), [俄语](README-ru.md), [西班牙语](README-es.md), [波兰语](README.pl.md)_
 
 [![pub package](https://img.shields.io/pub/v/get.svg?label=get&color=blue)](https://pub.dev/packages/get)
 ![building](https://github.com/jonataslaw/get/workflows/build/badge.svg)

 library rx_stream;
 
 import 'dart:async';
-import 'package:flutter/scheduler.dart';
-
 import '../rx_typedefs/rx_typedefs.dart';
 
 part 'get_stream.dart';

@@ -122,15 +122,19 @@ abstract class GetNotifier<T> extends Value<T> with GetLifeCycleBase {
 }
 
 extension StateExt<T> on StateMixin<T> {
-  Widget obx(NotifierBuilder<T> widget, {Widget Function(String error) onError, Widget onLoading}) {
+  Widget obx(
+    NotifierBuilder<T> widget, {
+    Widget Function(String error) onError,
+    Widget onLoading,
+  }) {
     assert(widget != null);
     return SimpleBuilder(builder: (_) {
       if (status.isLoading) {
-        return onLoading ?? CircularProgressIndicator();
+        return onLoading ?? Center(child: CircularProgressIndicator());
       } else if (status.isError) {
         return onError != null
             ? onError(status.errorMessage)
-            : Text('A error occured: ${status.errorMessage}');
+            : Center(child: Text('A error occured: ${status.errorMessage}'));
       } else {
         return widget(value);
       }