[master] da6b9216d mention if-range in changelog

[Guillaume Quintard]

commit da6b9216dfdae0a2578169f8708a15eaedf1cb0d
Author: Guillaume Quintard <guillaume at varnish-software.com>
Date:   Mon Nov 11 09:43:20 2019 -0800

    mention if-range in changelog

diff --git a/doc/changes.rst b/doc/changes.rst
index 37c638da8..e0c5acadd 100644
--- a/doc/changes.rst
+++ b/doc/changes.rst
@@ -49,6 +49,9 @@ NEXT (2020-03-15)
   before the VCL callback, now it gets emitted after VCL returns for
   consistency with ``vcl_deliver {}``
 
+* The ``if-range`` header is now handled, allowing clients to conditionally
+  request a range based on a date or an ETag
+
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 Varnish Cache 6.3.0 (2019-09-15)
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