[master] c252050 Mention the new autoconf macros in the changelog

[Dridi Boukelmoune]

commit c252050bd51624eb5a6c3ac0adbf79ddeedf7171
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Wed Sep 14 17:53:42 2016 +0200

    Mention the new autoconf macros in the changelog

diff --git a/doc/sphinx/whats-new/changes-5.0.rst b/doc/sphinx/whats-new/changes-5.0.rst
index 9931e07..adc6247 100644
--- a/doc/sphinx/whats-new/changes-5.0.rst
+++ b/doc/sphinx/whats-new/changes-5.0.rst
@@ -220,7 +220,7 @@ News for VMOD authors
 ~~~~~~~~~~~~~~~~~~~~~
 
 * It is now mandatory to have a description in the ``$Module`` line of
-  a ``vcc`` file
+  a ``vcc`` file.
 
 * vcl cli events (in particular, ``vcl_init{}`` /``vcl_fini{}``) now
   have a workspace and ``PRIV_TASK`` available for VMODs.
@@ -238,3 +238,8 @@ News for VMOD authors
   rewritten, there may still exist regressions which remained unnoticed
 
 * ``vmodtool.py`` now requires at least Python 2.6
+
+* New autoconf macros are available, they should greatly simplify build
+  systems of out-of-tree VMODs.  They are implemented and documented in
+  ``varnish.m4``, and the previous macros now live in ``varnish-legacy.m4``
+  so existing VMODs should still build fine.