title: NodeJS winston log file not change upon size limit
body: <p>I'm using <a href="https://github.com/flatiron/winston/" rel="noreferrer">Winston</a> logging and have specified file size to be max 10MB. </p>
  
  <pre><code>{
      filename: 'e:\app.log', 
      json:false, 
      maxsize:'10MB', 
      maxFiles:'10', 
      timestamp:true, 
      level:'silly'
  }
  </code></pre>
  
  <p>I'm expecting the app.log file to be rotated upon size reaching 10MB, but this has never happened and my log file grows to even GBs. </p>
  
  <p>Is there something I'm doing wrongly?　Thanks.</p>