message: fix(docs): update angular.json config file
  update of ng-cli.md as of [this link](https://github.com/angular/angular-cli/wiki/angular-workspace), with Angular 6.0.0 the filename was changed from .angular-cli.json to angular.json.
diff: @@ -32,11 +32,11 @@ import { AlertModule } from 'ngx-bootstrap';
  })
  ```
  -- Open `.angular-cli.json` and insert a new entry into the styles array:
  +- Open `angular.json` and insert a new entry into the styles array:
  ```json
  "styles": [
  - "../node_modules/bootstrap/dist/css/bootstrap.min.css",
  + "./node_modules/bootstrap/dist/css/bootstrap.min.css",
  "styles.css",
  ],
  ```
  