Remove unnecessary newline.

stanzahandling.go

@@ -20,7 +20,7 @@ func sendIQ(client *xmpp.Client, iqc chan xmpp.IQ, target string, iQtype string,
 	c := make(chan xmpp.IQ)
 	go getIQ(id, c, iqc)
 	_, err := client.RawInformation(client.JID(), target, id,
-		iQtype, content+"\n")
+		iQtype, content)
 	if errors.Unwrap(err) != nil {
 		return iq, fmt.Errorf("sendIQ: failed to send iq: %w", err)
 	}