title: Get IPv4 Address of client in socket.io
body: <p>When I log the 'socket' object during socket.on('connection'), I get the following information:
  <code>_peername: { address: '::1', family: 'IPv6', port: 57535 }</code></p>
  
  <p>How do I change the family to IPv4 during socket connection?</p>