Capitalise scalar types generated by TH when they are lowercase

[lukel97]

Some schemas generated by Hasura, for example, contain types that are all lower case:

scalar uuid

When using defineByDocumentFile, the code generated by Template Haskell complains that the type constructor is illegal as it doesn't begin with a capital letter:

Main.hs:15:1: error:
    Illegal type constructor or class name: ‘uuid’
    When splicing a TH declaration:
      data LookupSpotifyOAuthArgs
    = LookupSpotifyOAuthArgs {id :: (GHC.Maybe.Maybe uuid)}
    deriving GHC.Generics.Generic
    deriving GHC.Show.Show
    deriving GHC.Classes.Eq

Would it be possible to automatically convert these references of uuid to Uuid?

[nalchevanidze]

fixed in #526. please close this issue if it works for you