Update README.md

Author: kevinchalet

README.md

@@ -29,10 +29,10 @@ app.UseOAuthIntrospection(options => {
 
 ## Support
 
-**Need help or wanna share your thoughts?** Don't hesitate to join our dedicated chat rooms:
+**Need help or wanna share your thoughts?** Don't hesitate to join us on Gitter or ask your question on StackOverflow:
 
-- **JabbR: [https://jabbr.net/#/rooms/aspnet-contrib](https://jabbr.net/#/rooms/aspnet-contrib)**
 - **Gitter: [https://gitter.im/aspnet-contrib/AspNet.Security.OAuth.Extensions](https://gitter.im/aspnet-contrib/AspNet.Security.OAuth.Extensions)**
+- **StackOverflow: [https://stackoverflow.com/questions/tagged/aspnet-contrib](https://stackoverflow.com/questions/tagged/aspnet-contrib)**
 
 ## Contributors