removes repeated characters in README (#295)

Author: Kanna727

README.md

@@ -28,7 +28,7 @@ The DailyRotateFile transport can rotate files by minute, hour, day, month, year
 * **maxSize:** Maximum size of the file after which it will rotate. This can be a number of bytes, or units of kb, mb, and gb. If using the units, add 'k', 'm', or 'g' as the suffix. The units need to directly follow the number. (default: null)
 * **maxFiles:** Maximum number of logs to keep. If not set, no logs will be removed. This can be a number of files or number of days. If using days, add 'd' as the suffix. (default: null)
 * **options:** An object resembling https://nodejs.org/api/fs.html#fs_fs_createwritestream_path_options indicating additional options that should be passed to the file stream. (default: `{ flags: 'a' }`)
-* **auditFile**: A string representing the name of the name of the audit file. This can be used to override the default filename which is generated by computing a hash of the options object. (default: '.<optionsHash>.json')
+* **auditFile**: A string representing the name of the audit file. This can be used to override the default filename which is generated by computing a hash of the options object. (default: '.<optionsHash>.json')
 * **utc**: Use UTC time for date in filename. (default: false)
 * **extension**: File extension to be appended to the filename. (default: '')
 * **createSymlink**: Create a tailable symlink to the current active log file. (default: false)