title: lodash assign key value pair
body: <p>How do transform this</p>
  
  <pre><code>[ { '1491926400000': 222 }, { '1491926400000': 489 } ]
  </code></pre>
  
  <p>to this:</p>
  
  <pre><code>[ { date: '1491926400000', count: 222 }, { date: '1491926400000', count: 489 } ]
  </code></pre>
  
  <p>I have tried with 'reduce' and 'transform' using lodash but not going anywhere with it. </p>