fix startNotifyFlowHandler (issue #13)

publish.go

@@ -218,15 +218,17 @@ func (publisher *Publisher) Publish(
 }
 
 func (publisher *Publisher) startNotifyFlowHandler() {
+	// Listeners for active=true flow control.  When true is sent to a listener,
+	// publishing should pause until false is sent to listeners.
 	for ok := range publisher.notifyFlowChan {
 		publisher.disablePublishDueToFlowMux.Lock()
-		publisher.logger.Printf("pausing publishing due to flow request from server")
 		if ok {
-			publisher.disablePublishDueToFlow = false
-		} else {
+			publisher.logger.Printf("pausing publishing due to flow request from server")
 			publisher.disablePublishDueToFlow = true
+		} else {
+			publisher.disablePublishDueToFlow = false
+			publisher.logger.Printf("resuming publishing due to flow request from server")
 		}
 		publisher.disablePublishDueToFlowMux.Unlock()
-		publisher.logger.Printf("resuming publishing due to flow request from server")
 	}
 }