Cope with UUIDs column type

[ricleal-fugue]

Following my comment on PR #41 I added support for the column type uuid in postgres.

Let me know of more info is needed to merge this.

[ricleal-fugue]

I realized that was just a simple change needed!!!!

FYI, it works!

DB:

+---------------------+--------------------------+-----------+
| Column              | Type                     | Modifiers |
|---------------------+--------------------------+-----------|
| id                  | uuid                     |  not null |
| organization_id     | uuid                     |  not null |

[fraenky8]

Hi @ricleal-fugue, thanks for this PR! Like this super simple change! Thanks for testing and confirming 👍 Will merge and tag soon.