Unable to import library inside a vue.js project

I'm not able to import using:

```js
import { SecureDfu } from 'web-bluetooth-dfu';
```

Result:
```console
This dependency was not found:

* web-bluetooth-dfu in ...
```


However both of these do work:
```js
import SecureDfu from 'web-bluetooth-dfu/lib';
// or
import { SecureDfu } from 'web-bluetooth-dfu/lib/secure-dfu';
```

