README.md in fluent-plugin-mqtt-0.0.3 vs README.md in fluent-plugin-mqtt-0.0.4

@@ -25,9 +25,11 @@
 
 <source>
   type mqtt
   bind 127.0.0.1
   port 1883
+  username username
+  password password
 </source>
 
 ```
 
 ## Contributing