docs: Import 9.1.3 release notes, add news item.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
diff --git a/docs/index.html b/docs/index.html
index 65fb62d..be09582 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -16,6 +16,12 @@
 
 <h1>News</h1>
 
+<h2>May 21, 2013</h2>
+<p>
+<a href="relnotes/9.1.3.html">Mesa 9.1.3</a> is released.
+This is a bug fix release.
+</p>
+
 <h2>April 30, 2013</h2>
 <p>
 <a href="relnotes/9.1.2.html">Mesa 9.1.2</a> is released.