list of dicts

hi,
I have not found a way to have a list of dicts and validate it.

this is the config
```
cars:
- manufacturer: volvo
color: red
modell: typec
- manufacturer: toyota
color: blue
modell: typeb
- manufacturer: volvo
color: green
modell: typea

```
example of not working validation:
```

cars: [
{
"manufacturer": confuse.String(default=""),
"color": confuse.String(default=""),
"modell": confuse.String(default="")
}
]
}
```

in the end i just validated it by:
`cars: list`

but when i run config.dump() i get back the config in yaml but the list as an json/dict
```
something: value
something2: value
cars: [{"manufacturer":"volvo","color":"red","modell":"typec"},{"manufacturer":"toyota","color":"blue","modell":"typeb"},{"manufacturer":"volvo","color":"green","modell":"typea"}]

```