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

[Alberts Muktupāvels <muktupavels src gnome org>]

commit ec764252b1e54e3f2dde9f9c6c3743f336747783
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Apr 16 22:02:27 2016 +0300

    bump version to 3.20.0, update NEWS

 NEWS         |   16 ++++++++++++++++
 configure.ac |    4 ++--
 2 files changed, 18 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 0def332..2ef8e1f 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,19 @@
+Version 3.20.0
+==============
+- Added option to use dark theme variant.
+- Updated man page. (Dmitry Shachnev)
+- Updated theme for GTK+ 3.20. (Alberts Muktupāvels, Balló György)
+- Fixed crash when moving applet between panels.
+- Fixed few deprecation warnings.
+- Fix applet menu location on multi-monitor setup. (Timo Kluck)
+- Updated translations:
+  Alexandre Franke (fr), Aurimas Černius (lt), Cédric Valmary (oc),
+  Dušan Kazik (sk), Gianvito Cavasoli (it), Jordi Mas (ca),
+  Josef Andersson (sv), Kjartan Maraas (nb), Marek Černocký (cs),
+  Mario Blättermann (de), Milo Casagrande (it), Мирослав Николић (sr, sr latin),
+  Necdet Yücel (tr), Pedro Albuquerque (pt), Piotr Drąg (pl),
+  Rafael Fontenelle (pt_BR), Tom Tryfonidis (el), Trần Ngọc Quân (vi).
+
 Version 3.18.1
 ==============
 - Fully ported away from gnome-common.
diff --git a/configure.ac b/configure.ac
index 1cd826f..675a67c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,8 +3,8 @@ dnl Define version info
 dnl **************************************************************************
 
 m4_define([gp_major_version], [3])
-m4_define([gp_minor_version], [19])
-m4_define([gp_micro_version], [1])
+m4_define([gp_minor_version], [20])
+m4_define([gp_micro_version], [0])
 m4_define([gp_version], [gp_major_version.gp_minor_version.gp_micro_version])
 
 dnl **************************************************************************