unsneak player after stopped sitting

src/com/cnaude/chairs/Chairs.java

@@ -164,6 +164,7 @@ public class Chairs extends JavaPlugin {
     		sit.remove(player.getName());
     		Bukkit.getScheduler().cancelTask(sittask.get(player.getName()));
     		sittask.remove(player.getName());
+    		player.setSneaking(false);
     		if (notifyplayer && !msgStanding.isEmpty()) {
             	player.sendMessage(msgStanding);
         	}