Update README.md

Author: kengoon

README.md

@@ -117,7 +117,9 @@ location in this case will come the JSON configuration file downloaded from the
 
 #### OnCompleteListener
 ```python
-class sjfirebase.jinterface.google.OnCompleteListener
+class sjfirebase.jinterface.google
+
+.OnCompleteListener
 ```
 Listener called when a Task completes.