message: chore(docs): updated instructions for angular-seed
  * Update NPM dependencies
  Bootstrap v4 removed bootstrap-theme
  * Sync with upstream: s/let/const/
diff: @@ -17,13 +17,14 @@ this.NPM_DEPENDENCIES = [
  // {src: 'lodash/lodash.min.js', inject: 'libs'},
  { src: 'bootstrap/dist/js/bootstrap.min.js', inject: 'libs' },
  { src: 'bootstrap/dist/css/bootstrap.min.css', inject: true }, // inject into css section
  - { src: 'bootstrap/dist/css/bootstrap-theme.min.css', inject: true }, // inject into css section
  - { src: 'bootstrap/dist/css/bootstrap-theme.min.css.map', inject: true }, // inject into css section
  + // Uncomment when using Bootstrap v3. Bootstrap v4 removed bootstrap-theme
  + // { src: 'bootstrap/dist/css/bootstrap-theme.min.css', inject: true }, // inject into css section
  + // { src: 'bootstrap/dist/css/bootstrap-theme.min.css.map', inject: true }, // inject into css section
  ];
  // *towards the bottom, replace extended packages with this:
  -let additionalPackages: ExtendPackages[] = [
  +const additionalPackages: ExtendPackages[] = [
  // required for dev build
  {
  name: 'ngx-bootstrap',
  