`IntrospectSchemaFieldType` instance for `UUID`

[rynoV]

After adding an input with a UUID field, for example:

scalar UUID

input MyInput {
  id: UUID!
}

I get

Could not deduce (mu-graphql-0.5.0.4:Mu.GraphQL.Query.Introspection.IntrospectSchemaFieldType
                          ('TPrimitive UUID))

Would it be possible to add this instance? I'm guessing it would be here:

mu-haskell/graphql/src/Mu/GraphQL/Query/Introspection.hs

Lines 360 to 367 in 3d0a80e

	instance IntrospectSchemaFieldType ('Mu.TPrimitive String) where
	introspectSchemaFieldType _ _ = tNonNull $ tSimple "String"
	instance IntrospectSchemaFieldType ('Mu.TPrimitive T.Text) where
	introspectSchemaFieldType _ _ = tNonNull $ tSimple "String"
	instance IntrospectSchemaFieldType ('Mu.TPrimitive JSON.Value) where
	introspectSchemaFieldType _ _ = tNonNull $ tSimple "JSON"
	instance IntrospectSchemaFieldType ('Mu.TPrimitive JSON.Object) where
	introspectSchemaFieldType _ _ = tNonNull $ tSimple "JSONObject"