[master] f223c6d5e Document the VRT version bump in the 6.1 release notes.

[Geoff Simmons]

commit f223c6d5e0f2731c8f33eb5b856952acb2090c40
Author: Geoff Simmons <geoff at uplex.de>
Date:   Mon Sep 17 13:15:13 2018 +0200

    Document the VRT version bump in the 6.1 release notes.

diff --git a/doc/sphinx/whats-new/upgrading-6.1.rst b/doc/sphinx/whats-new/upgrading-6.1.rst
index 27d5e4acb..a082b3cc5 100644
--- a/doc/sphinx/whats-new/upgrading-6.1.rst
+++ b/doc/sphinx/whats-new/upgrading-6.1.rst
@@ -329,6 +329,9 @@ Other changes
   * The Varnish API soname version (for libvarnishapi.so) has been
     bumped to 2.0.0.
 
+  * The VRT version has been bumped to 8.0. See ``vrt.h`` for details
+    on the changes since 7.0.
+
   * Space required by varnish for maintaining the ``PRIV_TASK`` and
     ``PRIV_TOP`` parameters is now taken from the appropriate
     workspace rather than from the heap as before. For a failing