Use line buffering for mirror client

Handy when monitoring log files to get more incremental output.

Author: dcoutts

MirrorClient.hs

@@ -79,6 +79,8 @@ data MirrorState = MirrorState {
 
 main :: IO ()
 main = toplevelHandler $ do
+  hSetBuffering stdout LineBuffering
+
   args <- getArgs
   (verbosity, opts) <- validateOpts args