[librsvg] Update NEWS

[Federico Mena Quintero <federico src gnome org>]

commit 41345523c756297b0b88dbcfeedc38e5f5c86c18
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Jan 5 19:40:39 2016 -0600

    Update NEWS

 NEWS |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 14037ab..5bae674 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,10 @@
+Version 2.40.13
+- Menner added basic support for the "baseline-shift" attribute in
+  text objects.  We support "sub", "super", and plain "baseline", so
+  you can at least have subscripts and superscripts for formulas and
+  such.  There is no support for percentages or explicit lengths yet.
+  bgo#340047.
+
 Version 2.40.12
 - Benjamin Otte did *great* work in refactoring the test harness to
   use Glib's gtest infrastructure, instead of using home-grown