title: os.tmpDir() is deprecated - node and formidable
body: <p>I use node version 7.2.0 and formidable version 1.0.17 for file upload. After updating to the node version 7.2.0 I now get the following error when uploading files:</p>
  
  <p><code>(node:3376) DeprecationWarning: os.tmpDir() is deprecated. Use os.tmpdir() instead.</code></p>
  
  <p>I don't use the default of <code>form.uploadDir</code> but some custom path.</p>
  
  <p>How would I fix that error?</p>