Fix discord command registration

Signed-off-by: Lixfel <git-5w3l@lixfel.de>

src/de/steamwar/velocitycore/discord/DiscordBot.java

@@ -187,7 +187,8 @@ public class DiscordBot {
         updateCommands
                 .addCommands(getCommands()
                         .keySet().stream()
-                        .map(swCommand -> new CommandData(swCommand, "SteamWar Command").addOptions(new OptionData(OptionType.STRING, ARGUMENT_NAME, "SteamWar arguments", false)))
+                        .filter(command -> command.matches("^[\\w-]+$."))
+                        .map(command -> new CommandData(command, "SteamWar Command").addOptions(new OptionData(OptionType.STRING, ARGUMENT_NAME, "SteamWar arguments", false)))
                         .toArray(CommandData[]::new))
                 .complete();
     }