title: Trailing comma after last line in object
body: <p>I'm using Prettier in VS Code. I noticed that when using format on save, Prettier adds trailing commas on the last line of an object every time.</p>
  <p>For example, let's say I had a JS object like this:</p>
  <pre><code>obj = {
   hello: 'hello',
   world: 'world'
  }
  </code></pre>
  <p>Prettier turns it into this:</p>
  <pre><code>obj = {
   hello: 'hello',
   world: 'world',
  }
  </code></pre>
  <blockquote>
  <p>Notice the extra comma after <code>'world'</code></p>
  </blockquote>
  <p>Didn't find in the settings an option to fix this.</p>