Adding Generic instance for HugeInt (#8)

* Adding Generic instance for HugeInt

* Opting for derive instead of derive newtype

Author: ethul

src/Data/HugeInt.purs

@@ -19,6 +19,7 @@ module Data.HugeInt
 import Prelude
 
 import Data.String (length, drop, takeWhile)
+import Data.Generic (class Generic)
 import Data.Int (toNumber)
 import Data.Int (round) as Int
 import Data.Maybe (Maybe(..))
@@ -27,6 +28,8 @@ import Data.HugeNum as HN
 
 newtype HugeInt = HugeInt HugeNum
 
+derive instance genericHugeInt :: Generic HugeInt
+
 instance eqHugeInt :: Eq HugeInt where
   eq (HugeInt h1) (HugeInt h2) = h1 == h2