From a3225b059356233af601523f8d06377d7df15bc5 Mon Sep 17 00:00:00 2001
From: Denis Anisimov <denis@vaadin.com>
Date: Thu, 9 Mar 2017 11:09:57 +0200
Subject: [PATCH] Use correct polyfill version for mine-sweeper demo.

It doesn't fix #203 but at least this is necessary for it to work. Other
issues are most likely inside the HB itself.