op-build v2.0.4 release notes

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/doc/release-notes/index.rst b/doc/release-notes/index.rst
index 7919ed8..80a8054 100644
--- a/doc/release-notes/index.rst
+++ b/doc/release-notes/index.rst
@@ -18,5 +18,6 @@
    v2.0.1
    v2.0.2
    v2.0.3
+   v2.0.4
    v2.1-rc1
    v2.1