Fix warnings in tests

Author: sharkdp

test/Main.purs

@@ -1,6 +1,6 @@
 module Test.Main where
 
-import Prelude
+import Prelude hiding (not)
 import Control.Monad.Eff (Eff)
 import Control.Monad.Eff.Console (CONSOLE, log)
 import Data.Array (filter, range)