website/news.html: add 2016.08-rc1 announcement link

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

docs/website/news.html

@@ -20,7 +20,8 @@
 	<p>We have a new release candidate! Lots of
 	  changes all over the tree, see
 	  the <a href="http://git.buildroot.net/buildroot/plain/CHANGES?id=2016.08-rc1">CHANGES</a>
-	  file for details.
+	  file for details and read the
+	  <a href="http://lists.busybox.net/pipermail/buildroot/2016-August/169277.html">announcement</a>
 	</p>
 
 	<p>Head to the <a href="/downloads/">downloads page</a> to pick up the