mypy's "has no attribute" error

Hi,

Databases return `Record` class instance, and we can get column values by simply specifying column name
```
record = db.fetch_one(query=query, values=values)
print(record.id)
```

mypy gives the following error: `Mypy: "Record" has no attribute "id"  [attr-defined]`

Is there a way to set up mypy to work correctly with this use case?