docs/website: add announcement e-mail link for 2015.08-rc1

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

docs/website/news.html

@@ -11,9 +11,10 @@
   <li><b>5 August 2015 -- 2015.08-rc1 released</b>
 
     <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=2015.08-rc1">CHANGES</a>
-    file for details.</p>
+    tree, see
+    the <a href="http://git.buildroot.net/buildroot/plain/CHANGES?id=2015.08-rc1">CHANGES</a>
+    file for details, read
+    the <a href="http://lists.busybox.net/pipermail/buildroot/2015-August/135417.html">announcement</a>.</p>
 
     <p>Head to the <a href="/downloads/">downloads page</a> to pick up the
     <a href="/downloads/buildroot-2015.08-rc1.tar.bz2">2015.08-rc1