@Deprecated
  public static void init(int logLevel, LogConfiguration logConfiguration) {
    init(new LogConfiguration.Builder(logConfiguration).logLevel(logLevel).build());
  }
Initialize log system, should be called only once.

@param logLevel         the log level, logs with a lower level than which would not be printed
@param logConfiguration the log configuration
@deprecated the log level is part of log configuration now, use {@link #init(LogConfiguration)}
instead, since 1.3.0
xlog/src/main/java/com/elvishew/xlog/XLog.java