[broker-25] add empty line

Author: JavaSaBr

src/main/java/com/ss/mqtt/broker/network/packet/out/Connect311OutPacket.java

@@ -72,6 +72,7 @@ protected void writePayload(@NotNull ByteBuffer buffer) {
 
         // http://docs.oasis-open.org/mqtt/mqtt/v3.1.1/os/mqtt-v3.1.1-os.html#_Toc398718031
         writeString(buffer, clientId);
+       
         if (StringUtils.isNotEmpty(willTopic)) {
             appendWillProperties(buffer);
             writeString(buffer, willTopic);