void println(int logLevel, String msg) {
    if (logLevel < logConfiguration.logLevel) {
      return;
    }
    printlnInternal(logLevel, msg != null ? msg : "");
  }
Print a log in a new line.

@param logLevel the log level of the printing log
@param msg      the message you would like to log
xlog/src/main/java/com/elvishew/xlog/Logger.java