update README and ts for new auditHashType option

Author: mattberther

README.md

@@ -33,6 +33,7 @@ The DailyRotateFile transport can rotate files by minute, hour, day, month, year
 * **extension**: File extension to be appended to the filename. (default: '')
 * **createSymlink**: Create a tailable symlink to the current active log file. (default: false)
 * **symlinkName**: The name of the tailable symlink. (default: 'current.log')
+* **auditHashType**: Use specified hashing algorithm for audit. (default: 'sha256')
 
 ## Usage
 ``` js

index.d.ts

@@ -100,6 +100,11 @@ declare namespace DailyRotateFile {
         watchLog?: boolean;
 
         handleRejections?: boolean;
+
+        /**
+         * Use specified hashing algorithm for audit. (default: 'sha256')
+         */
+        auditHashType?: string;
     }
 }