Commits on Jan 19, 2022

1. allow for zero backup - in sync with log4js-node/streamroller#74 …

   **Important**
   It is also to note the file does not roll within itself (truncate its older entry for newer entry).
   It truncates all and appends only the new entry.
   
   ```javascript
   var rollers = require('streamroller');
   var stream = new rollers.RollingFileStream('myfile', 6, 0);
   stream.write("abc"); // add as first row
   stream.write("def"); // add as second row
   stream.write("ghi"); // truncate all and add as first row
   stream.end();
   ```
   
   Output:
   ```
   myfile   - ghi
   ```

   

   lamweili committed Jan 19, 2022
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