Enable completion suggestion after SELECT based on the tables

If you open the chinook db and run the following command

```
select artists.name,albums.title from artists,albums where artists.`ArtistId` = albums.`ArtistId`
```

litecli will only suggest completions for `artist.` and `albums.` after the `where`, but not after the `select`. That means, the `artists.name,albums.title` have to be typed characters by character without completion help.