"Child"/"Children" words are lowercased on singularize/pluralize.

```javascript
pluralize('car') // => cars
pluralize('Car') // => Cars
singularize('cars') // => car
singularize('Cars') // => Car

// So far, so good...

pluralize('child') // => children
pluralize('Child') // => children # why lowercased?
singularize('children') // => child
singularize('Children') // => child # why lowercased?
```

Using version 2.0.1.