[gnome-flashback] bump version to 3.20.0, update NEWS

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 3f59e1467a0447b29c2fc8b9b2419f560db4dc5f
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Apr 3 15:00:52 2016 +0300

    bump version to 3.20.0, update NEWS

 NEWS         |   18 ++++++++++++++++++
 configure.ac |    4 ++--
 2 files changed, 20 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 0bb72b8..2c8b358 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,21 @@
+Version 3.20.0
+==============
+- Fix crash in display-config with XRandR 1.2. (Alberts Muktupāvels)
+- Implement candidate popup in input-sources. (Sebastian Geiger)
+- Set XDG_CURRENT_DESKTOP if not set. (Alberts Muktupāvels)
+- Remove support for legacy-dirs. (Alberts Muktupāvels)
+- Add notifications, copy of notification-daemon. (Alberts Muktupāvels)
+- Show GNOME Software below all categories in the Applications menu. (Dmitry
+  Shachnev)
+- Add audio device selection dialog, based on gnome-shell. (Alberts Muktupāvels)
+- Updated translations:
+  Alejandro Quiroz (es), Balázs Meskó (hu), Dmitry Shachnev (ru),
+  Dušan Kazik (sk), Gábor Kelemen (hu), Gianvito Cavasoli (it),
+  Γιάννης Κουτσούκος (el), Jordi Mas (ca), Josef Andersson (sv),
+  Kjartan Maraas (nb), Mario Blättermann (de), Marek Černocký (cs),
+  Мирослав Николић (sr, sr latin), Pedro Albuquerque (pt), Piotr Drąg (pl),
+  Rafael Fontenelle (pt_BR), Stas Solovey (ru), Tom Tryfonidis (el).
+
 Version 3.18.1
 ==============
 - Improved input source switching. (Alberts Muktupāvels, Sebastian Geiger)
diff --git a/configure.ac b/configure.ac
index 52bf3e1..e995625 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,8 +3,8 @@ dnl Define version info
 dnl **************************************************************************
 
 m4_define([gf_major_version], [3])
-m4_define([gf_minor_version], [19])
-m4_define([gf_micro_version], [1])
+m4_define([gf_minor_version], [20])
+m4_define([gf_micro_version], [0])
 m4_define([gf_version], [gf_major_version.gf_minor_version.gf_micro_version])
 
 dnl **************************************************************************