Fix AppModule

Fixes proposal from https://github.com/bukhalo/nestjs-telegraf/pull/806

README.md

@@ -31,14 +31,15 @@ Once the installation process is complete, we can import the `TelegrafModule` in
 ```typescript
 import { Module } from '@nestjs/common';
 import { TelegrafModule } from 'nestjs-telegraf';
+import { AppUpdate } from './app.update';
 
 @Module({
   imports: [
     TelegrafModule.forRoot({
       token: 'TELEGRAM_BOT_TOKEN',
     }),
-    providers: [AppUpdate],
   ],
+  providers: [AppUpdate],
 })
 export class AppModule {}
 ```