Fix possible lock

main.go

@@ -40,8 +40,10 @@ type RealSleeper struct {
 }
 
 func (self RealSleeper) Sleep(ch chan<- interface{}) {
-	time.Sleep(self.duration)
-	ch <- nil
+	go func() {
+		time.Sleep(self.duration)
+		ch <- nil
+	}()
 }
 
 func getCmdLineParams(logger *log.Logger) (string, []int64) {