These no longer need GADTs.

src/Language/Go.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE DataKinds, GADTs #-}
+{-# LANGUAGE DataKinds #-}
 module Language.Go where
 
 import Prologue

src/Language/JavaScript.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE DataKinds, GADTs #-}
+{-# LANGUAGE DataKinds #-}
 module Language.JavaScript where
 
 import Info

src/Language/Ruby.hs

@@ -1,4 +1,4 @@
-{-# LANGUAGE DataKinds, GADTs #-}
+{-# LANGUAGE DataKinds #-}
 module Language.Ruby where
 
 import Data.List (partition)