docs: correct 11.1.1 release year

Seems like I wasn't ready to let 2015 go :-)

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/docs/index.html b/docs/index.html
index 2c1898b..2b1e646 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -26,7 +26,7 @@
 to obtain future fixes.
 </p>
 
-<h2>January 13, 2015</h2>
+<h2>January 13, 2016</h2>
 <p>
 <a href="relnotes/11.1.1.html">Mesa 11.1.1</a> is released.
 This is a bug-fix release.