update export example

In order to provide perfect compatibility with `require` the export needs to be done in both styles:

```js
let BuildClassifier = {};

BuildClassifier.answer = 42;

export let answer = BuildClassifier.answer;
export default BuildClassifier;
```

Locate the export example referenced by issue #35 and inspect how the package currently exposes its values. Update the example to show both named and default export styles for require compatibility, then verify the documented example matches the intended JavaScript usage.

Written by the indexing model from the issue text.