[4.1] 49f2354 Add vtc barriers to changelog.

[Lasse Karstensen]

commit 49f235404327e27005a8ac5cdf80e99633f8ba59
Author: Lasse Karstensen <lkarsten at varnish-software.com>
Date:   Tue Jun 14 11:04:27 2016 +0200

    Add vtc barriers to changelog.

diff --git a/doc/changes.rst b/doc/changes.rst
index 66165a6..e1ef37e 100644
--- a/doc/changes.rst
+++ b/doc/changes.rst
@@ -14,6 +14,9 @@ Changes since 4.1.2:
 
 * Add support for TCP Fastopen where available. Disabled by default.
 
+* [varnishtest] New syncronization primitive barriers added, improving
+  coordination when test cases call external programs.
+
 .. _1905: https://github.com/varnishcache/varnish-cache/pull/1905
 
 Bugs fixed