title: NOt able to upgrade to angular cli version 7
body: <p>we have currently running angular 6 application, we want to migrate application to angular cli version 7, but its not migrating to version 7. for migrating,  i did following steps:</p>
  
  <pre><code>remove node modules 
  uninstall angular cli
  npm install @angular/cli@latest -g
  </code></pre>
  
  <p>how to migrate to angular CLI 7?</p>