title: ng update to specific version
body: <p>I would like to update Angular from version 5.0 to version 6.1. The instructions at <a href="https://update.angular.io/" rel="noreferrer">https://update.angular.io/</a> suggest using <code>ng update @angular/core</code> to update. However this updates directly to version 7 instead of version 6.</p>
  <p>The <code>ng update</code> docs suggest that using <code>--to</code> would update to a specific version. However this does not seem to work. The exact command used is: <code>ng update @angular/core --to 6.1.0</code> But this updates to 7.0.0</p>
  <h4>EDIT:</h4>
  <p>I've tried using <code>--from=5.0.0 --to=6.1.9</code> but this didn't work. I've noticed we're stil using <code>angular-cli</code> version <code>1.6.4</code>. This version supports <code>--next</code> which according to the docs should <code>(Default: false) Install the next version, instead of the latest.</code> However this changes the <code>package.json</code> to use version <code>7.0.0</code> of all <code>@angular/*</code> packages</p>