How to load external template

```
@Component({
    selector: 'as-users',
    templateUrl: './users.html'
})
```

I get `console.error: "Unhandled Promise rejection:", "Failed to load users.html", "; Zone: ", "", "; Task:", "Promise,then", "; Value:', "Failed to load users.html", undefined.

`users.html` is in the same directory as this component
