public NLogLogger(Logger logger, NLogProviderOptions options)
 {
     _logger  = logger;
     _options = options ?? NLogProviderOptions.Default;
 }
 /// <summary>
 /// <see cref="NLogLoggerProvider"/> with default options.
 /// </summary>
 /// <param name="options"></param>
 public NLogLoggerProvider(NLogProviderOptions options)
 {
     Options = options;
 }