Added user-agent to logger middleware

Signed-off-by: Vishal Rana <vr@labstack.com>

Author: vishr

middleware/logger.go

@@ -68,10 +68,10 @@ var (
 	// DefaultLoggerConfig is the default Logger middleware config.
 	DefaultLoggerConfig = LoggerConfig{
 		Skipper: DefaultSkipper,
-		Format: `{"time":"${time_rfc3339_nano}","id":"${id}","remote_ip":"${remote_ip}","host":"${host}",` +
-			`"method":"${method}","uri":"${uri}","status":${status},"error":"${error}","latency":${latency},` +
-			`"latency_human":"${latency_human}","bytes_in":${bytes_in},` +
-			`"bytes_out":${bytes_out}}` + "\n",
+		Format: `{"time":"${time_rfc3339_nano}","id":"${id}","remote_ip":"${remote_ip}",` +
+			`"host":"${host}","method":"${method}","uri":"${uri}","user_agent":"${user_agent}",` +
+			`"status":${status},"error":"${error}","latency":${latency}","latency_human":"${latency_human}"` +
+			`,"bytes_in":${bytes_in},"bytes_out":${bytes_out}}` + "\n",
 		CustomTimeFormat: "2006-01-02 15:04:05.00000",
 		Output:           os.Stdout,
 		colorer:          color.New(),