Also remove parallel-io dependency from main module

src/Main.hs

@@ -3,7 +3,6 @@ module Main where
 import System.Exit
 import System.IO
 import Control.Monad
-import Control.Concurrent.ParallelIO
 import Control.Arrow (first)
 import Data.List (partition,minimumBy,genericLength)
 import Data.Ord (comparing)
@@ -203,6 +202,4 @@ exitErrorWith msg = do
         cleanupAndExitWith $ ExitFailure 3
 
 cleanupAndExitWith :: ExitCode -> IO ()
-cleanupAndExitWith code = do
-        stopGlobalPool
-        exitWith code
+cleanupAndExitWith code = exitWith code