Hey,
I'm trying to use servant-docs with a fairly simple example. Something like:
```
newtype User = User { username :: String }
deriving (Eq, Show, Arbitrary, Generic)
instance ToJSON User
type AuthAPI = "user" :> Get '[JSON] User
instance ToSample User where
toSample = Just g
where g = User "john-doe"
api :: Proxy AuthAPI
api = Proxy
md :: String
md = markdown $ docs api
```
And I get
```
.../src/AuthAPI.hs:23:3: error:
‘toSample’ is not a (visible) method of class ‘ToSample’
```
If it helps I'm using servant 0.8.1 and haskell2010. Any idea?
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