docs/website: update news.html with 2018.08-rc1 announcement link

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.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=2018.08-rc1">CHANGES</a>
-	  file for details.
+	  file for details and/or read
+	  the <a href="http://lists.busybox.net/pipermail/buildroot/2018-August/227070.html">announcement</a>.
 	</p>
 
 	<p>Head to the <a href="/downloads/">downloads page</a> to pick up the