Create releasenotes page for tempest 34.2.0

Change-Id: Ibc48eedb6c1fe7defca878c10805484b07b3f624
diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index 882413f..4c1edd5 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -6,6 +6,7 @@
    :maxdepth: 1
 
    unreleased
+   v34.2.0
    v34.0.0
    v33.0.0
    v32.0.0