Makes Producer's Ping method send a NOP command

producer.go

@@ -84,7 +84,7 @@ func NewProducer(addr string, config *Config) (*Producer, error) {
 }
 
 // Ping causes the Producer to connect to it's configured nsqd (if not already
-// connected), returning any error that might occur during the connection.
+// connected) and send a `Nop` command, returning any error that might occur.
 //
 // This method can be used to verify that a newly-created Producer instance is
 // configured correctly, rather than relying on the lazy "connect on Publish"
@@ -96,7 +96,8 @@ func (w *Producer) Ping() error {
 			return err
 		}
 	}
-	return nil
+
+	return w.conn.WriteCommand(Nop())
 }
 
 // SetLogger assigns the logger to use as well as a level