op-build v2.0.13 release notes

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
(cherry picked from commit 93817f98b4d51a36cccca26a39fe245c74c25114)
[stewart: fix up duplicate labels in rst]
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/doc/release-notes/index.rst b/doc/release-notes/index.rst
index d3ebb68..163f3f3 100644
--- a/doc/release-notes/index.rst
+++ b/doc/release-notes/index.rst
@@ -44,6 +44,7 @@
    v2.0.10
    v2.0.11
    v2.0.12
+   v2.0.13
 
 v2.1
 ----
@@ -61,4 +62,3 @@
    :maxdepth: 1
 
    v2.2-rc1
-