Fixed issue where whatsNew would not print if the changelog is too long

Author: Muchaszewski

Slack-GPT-Socket/SlackHandlers/Command/WhatsNewCommandStrategy.cs

@@ -87,6 +87,6 @@ public async Task<SlashCommandResponse> Execute(SlashCommand command)
             releaseNotes.AppendLine($"\t{release.HtmlUrl}");
         }
 
-        return CommandStrategyUtils.SlashCommandResponse(releaseNotes.ToString());
+        return CommandStrategyUtils.SlashCommandResponse(releaseNotes.ToString()[..1000]);
     }
 }