defaults.name does not work

### Issue
Not a big deal, really.

According to docs, I would expect the following code to work:

```js
const Foo = PouchDB.defaults({
name: 'foo'
})

const foo = new Foo()
```

but it throws with `Error: Missing/invalid DB name`.

### Info
- Environment: Node (using `pouchdb-node` package)
- Platform: Windows