docs: add news item and link release notes for 11.1.3

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/docs/relnotes.html b/docs/relnotes.html
index b04d786..6469031 100644
--- a/docs/relnotes.html
+++ b/docs/relnotes.html
@@ -22,6 +22,7 @@
 
 <ul>
 <li><a href="relnotes/11.2.1.html">11.2.1 release notes</a>
+<li><a href="relnotes/11.1.3.html">11.1.3 release notes</a>
 <li><a href="relnotes/11.2.0.html">11.2.0 release notes</a>
 <li><a href="relnotes/11.1.2.html">11.1.2 release notes</a>
 <li><a href="relnotes/11.0.9.html">11.0.9 release notes</a>