update help msg.

Client.cpp

@@ -177,6 +177,8 @@ void Client::parsePrintedLine()
     say("> Broadcast a message: .qw <message> and .spam <message>");
     //, beware of the floodprot limits 600s for .qw and 300s for .spam");
     say("> (Un)Mute: .qw_mute .qw_unmute or .spam_mute .spam_unmute");
+    say("> Last 5 messages: .lastmsgs");
+
 		return;
 	}