Cannot read property 'database' of undefined

This is simply because it expects an options object. Simple fix in `packages/final-arango/src/index.js 
` is to do `arango (dbOptions = {})` on line 23.

```bash
/Users/noah/Projects/final/packages/final-arango/dist/index.js:42
  const database = dbOptions.database || 'test';
                             ^

TypeError: Cannot read property 'database' of undefined
```