Update README.md

Author: kevinchalet

README.md

@@ -20,10 +20,8 @@ app.UseOAuthValidation(options =>
 ```csharp
 app.UseOAuthIntrospection(options =>
 {
-    options.AutomaticAuthenticate = true;
-    options.AutomaticChallenge = true;
+    options.Authority = new Uri("https://openid.yourapp.com/");
     options.Audiences.Add("resource_server");
-    options.Authority = "http://localhost:54540/";
     options.ClientId = "resource_server";
     options.ClientSecret = "875sqd4s5d748z78z7ds1ff8zz8814ff88ed8ea4z4zzd";
 });