[metacity] bump version to 3.20.0, update NEWS

[Alberts Muktupāvels <muktupavels src gnome org>]

commit f71ea421af63311f4e212944c2747fe34e5d7572
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Fri Jun 10 00:45:02 2016 +0300

    bump version to 3.20.0, update NEWS

 NEWS         |   22 ++++++++++++++++++++++
 configure.ac |    4 ++--
 2 files changed, 24 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 9bf8c75..d13d1cb 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,25 @@
+Version 3.20.0
+==============
+- Allow minimizing windows which don't advertise support for it. (Jasper
+  St. Pierre)
+- Metacity follows Mutter and by default will use GTK+ theme. It is still
+  possible to use Metacity themes by adjusting settings. (Alberts Muktupāvels)
+- Previously shipped Metacity themes has been removed. (Alberts Muktupāvels)
+- Metacity theme settings now is under new GSettings schema -
+  org.gnome.metacity.theme. (Alberts Muktupāvels)
+- Metacity now has new library - libmetacity. (Alberts Muktupāvels)
+- New Metacity theme viewer - can be used to preview both Metacity and GTK+
+  themes. (Alberts Muktupāvels)
+- Scale window decorations on HiDPI displays, based on mutter. (Alberts
+  Muktupāvels, Florian Müllner, Iain Lane)
+- Updated translations:
+  Aurimas Černius (lt), Balázs Meskó (hu), Balázs Úr (hu),
+  Cédric Valmary (oc), Daniel Mustieles (es), Gábor Kelemen (hu),
+  Josef Andersson (sv), Luis Enrique Ortega Rojas (es), Marek Černocký (cs),
+  Mario Blättermann (de), Марко Костић (sr), Милош Поповић (sr latin),
+  Мирослав Николић (sr, sr latin), Muhammet Kara (tr), Piotr Drąg (pl),
+  Rafael Fontenelle (pt_BR).
+
 Version 3.18.1
 ==============
 - Updated translations:
diff --git a/configure.ac b/configure.ac
index e8e67fa..392ce14 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,8 +3,8 @@ dnl Define version info
 dnl **************************************************************************
 
 m4_define([m_major_version], [3])
-m4_define([m_minor_version], [19])
-m4_define([m_micro_version], [1])
+m4_define([m_minor_version], [20])
+m4_define([m_micro_version], [0])
 m4_define([m_version], [m_major_version.m_minor_version.m_micro_version])
 
 dnl **************************************************************************