Autocomplete for columns

Hi there!

I don't think this plugin supports autocompletion for columns as of today.
Would this be something that would be possible to add?

It should be possible to read the .yml files, and if the columns exists, give some guidance about different columns. Could be even more advanced in the future and actually find columns from sql files and such, but that might be overkill to start with :P

Cheers!