title: electronjs - how can I get mac address of the machine
body: <p>I am building a desktop app using electronjs.
  I want to be able to identify a machine uniquely. I believe it should be ok to use mac address of the machine as unique identifier.
  I don't know how to get mac address of the machine. Couldn't find any good example on internet.
  Appreciate all the help.</p>
  <p>Thank you.</p>