Updating to latest openolt chart after release

Change-Id: Ie1e26ed40ee9af787cb42d32ab989eb7515c154c
diff --git a/conf.py b/conf.py
index 05a442a..7969551 100644
--- a/conf.py
+++ b/conf.py
@@ -56,6 +56,7 @@
     'sphinxcontrib.spelling',
     "sphinx_multiversion",
     "sphinx.ext.intersphinx",
+    "sphinxcontrib.openapi",
 ]
 
 # API documentation