op-build v2.0.15 release notes

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
(cherry picked from commit b6d8b53dad80d43a00cc9a40bb30d9b5d646866c)
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/doc/release-notes/index.rst b/doc/release-notes/index.rst
index 3446e7f..a21fa48 100644
--- a/doc/release-notes/index.rst
+++ b/doc/release-notes/index.rst
@@ -46,6 +46,7 @@
    v2.0.12
    v2.0.13
    v2.0.14
+   v2.0.15
 
 v2.1
 ----
@@ -65,4 +66,3 @@
    v2.2-rc1
    v2.2-rc2
    v2.2
-