title: Angular CLI - Cannot ng update @angular/core due to rxjs dependency
body: <p>I'm trying to update angular and angular material to version 6, and I've already updated the cli to allow the new <em>ng update</em> command, but when trying to use it to update <em>@angular/core</em>, I get an error every time saying that <em>@angular/flex-layout</em> has an incompatible peer dependency to rxjs, requiring at least version 5.5.0.</p>
  
  <p>This doesn't make sense, because I have already updated rxjs globally and locally to version 6.2.0, and this is proven when I check the package version.</p>
  
  <p>Console output below:</p>
  
  <blockquote>
  <pre><code>PS F:\Nick\Angular\firebase-work&gt; npm update @angular/core
      Package "@angular/flex-layout" has an incompatible peer dependency to "rxjs" (requires "^5.5.0, would install "6.2.0").
  Incompatible peer dependencies found. See above.
  PS F:\Nick\Angular\firebase-work&gt; npm view rxjs version
  6.2.0
  PS F:\Nick\Angular\firebase-work&gt; npm view rxjs -g version
  6.2.0
  F:\Nick\Angular\firebase-work&gt;
  </code></pre>
  </blockquote>