Fix Gzip example

Author: hdgarrood

example/Gzip.js

@@ -5,3 +5,5 @@
 // module Gzip
 
 exports.gzip = require('zlib').createGzip;
+exports.stdout = process.stdout;
+exports.stdin = process.stdin;

example/Gzip.purs

@@ -3,16 +3,15 @@ module Gzip where
 import Prelude
 
 import Node.Stream
-import Node.Stream.StdIO
 
 import Control.Monad.Eff
 import Control.Monad.Eff.Console
 
 foreign import data GZIP :: !
 
 foreign import gzip :: forall eff. Eff (gzip :: GZIP | eff) (Duplex (gzip :: GZIP | eff))
-
-foreign import
+foreign import stdin :: forall eff. Readable () (console :: CONSOLE | eff)
+foreign import stdout :: forall eff. Writable () (console :: CONSOLE | eff)
 
 main = do
   z <- gzip