title: node-fetch only returning promise pending
body: <p>I am trying out <code>node-fetch</code> and the only result I am getting is:</p>
  
  <p><code>Promise { &lt;pending&gt; }</code></p>
  
  <p>How can I fix this so I get a completed <code>promise</code>?</p>
  
  <p>code:</p>
  
  <pre><code>var nf = require('node-fetch');
  
  nf(url).then(function(u){console.log(u.json())})
  </code></pre>