public static Logger.Builder jsonFormatter(JsonFormatter jsonFormatter) {
    return new Logger.Builder().jsonFormatter(jsonFormatter);
  }
Start to customize a {@link Logger} and set the {@link JsonFormatter}.

@param jsonFormatter the {@link JsonFormatter} to customize
@return the {@link Logger.Builder} to build the {@link Logger}
xlog/src/main/java/com/elvishew/xlog/XLog.java