[6.6] 8e9934082 Add VSV00007 to the changelog

[Martin Blix Grydeland]

commit 8e99340827efdb527dfc1e014d289f5caa430889
Author: Martin Blix Grydeland <martin at varnish-software.com>
Date:   Thu Jul 1 16:26:16 2021 +0200

    Add VSV00007 to the changelog

diff --git a/doc/changes.rst b/doc/changes.rst
index b63db87c8..6640e7e82 100644
--- a/doc/changes.rst
+++ b/doc/changes.rst
@@ -31,6 +31,14 @@ http://varnish-cache.org/docs/trunk/whats-new/index.html and via
 individual releases. These documents are updated as part of the
 release process.
 
+================================
+Varnish Cache 6.6.1 (unreleased)
+================================
+
+* Fix an HTTP/2.0 request smuggling vulnerability. (VSV00007_)
+
+.. _VSV00007: https://varnish-cache.org/security/VSV00007.html
+
 ================================
 Varnish Cache 6.6.0 (2021-03-15)
 ================================