Fixed readme.

Author: SeppPenner

README.md

@@ -16,8 +16,8 @@ Serilog.Sinks.Telegram.Alternative is a library to save logging information from
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 ## Available for
-* Net 6.0
 * Net 8.0
+* Net 9.0
 
 ## Net Core and Net Framework latest and LTS versions
 * https://dotnet.microsoft.com/download/dotnet