Catch ClosedChannelException in TaskTraceEvent

sbt would print a stack trace on exit when run with
-Dsbt.task.timings=true. This removes that annoying stack trace.

main/src/main/scala/sbt/internal/TaskTraceEvent.scala

@@ -73,7 +73,8 @@ private[sbt] final class TaskTraceEvent
       ()
     } finally {
       trace.close()
-      console.println(s"wrote $outFile")
+      try console.println(s"wrote $outFile")
+      catch { case _: java.nio.channels.ClosedChannelException => }
     }
   }
 }