Added

    import Control.Monad.Trans.Resource
to example in README.md needed to bring runResourceT into scope for
    runResourceT $ CB.sourceFile "input.txt" $$ CB.sinkFile "output.txt"

README.md

@@ -20,6 +20,7 @@ to start off.
 ## Synopsis
 
 ```haskell
+import Control.Monad.Trans.Resource
 import Data.Conduit
 import qualified Data.Conduit.List as CL
 import qualified Data.Conduit.Binary as CB