title: No matching version found for scheduler@^0.13.4
body: <p>There is a previous issue with react installing scheduler
  <a href="https://github.com/facebook/react/issues/13693" rel="nofollow noreferrer">https://github.com/facebook/react/issues/13693</a></p>
  
  <p>Yesterday I could <code>npm install</code>. Today with no changes to package.json I see this: </p>
  
  <pre><code>npm ERR! code ETARGET
  npm ERR! notarget No matching version found for scheduler@^0.13.4
  npm ERR! notarget In most cases you or one of your dependencies are requesting
  npm ERR! notarget a package version that doesn't exist.
  </code></pre>
  
  <p><code>scheduler</code> seems to have <code>0.13.4</code> <a href="https://www.npmjs.com/package/scheduler" rel="nofollow noreferrer">https://www.npmjs.com/package/scheduler</a> but I cannot install this module separately. I can however install <code>0.13.3</code> separately. It also looks like <code>0.13.4</code> was Published 16 hours ago.</p>
  
  <p>I'm using react <code>16.6.1</code></p>
  
  <p>Is anyone else experiencing this? Any solutions?</p>