[gtkmm] 3.20.0

[Murray Cumming <murrayc src gnome org>]

commit e2c96de61ba80b4f1516982cd5d57168bc1813f4
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Mar 28 12:27:55 2016 +0200

    3.20.0

 NEWS         |    6 +++++-
 configure.ac |    2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)
---
diff --git a/NEWS b/NEWS
index 586bf79..146fcdc 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,8 @@
-3.19.12:
+3.20.0 (stable):
+
+* No major changes compared to 3.19.12.
+
+3.19.12 (unstable):
 
 Gtk:
 * CellRendererProgress:_property_renderable(): Avoid infinite loop.
diff --git a/configure.ac b/configure.ac
index 6ef8771..1dc371b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,7 +15,7 @@
 ## You should have received a copy of the GNU Lesser General Public License
 ## along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
-AC_INIT([gtkmm], [3.19.12],
+AC_INIT([gtkmm], [3.20.0],
         [http://bugzilla.gnome.org/enter_bug.cgi?product=gtkmm],
         [gtkmm], [http://www.gtkmm.org/])
 AC_PREREQ([2.59])