[gtkmm-documentation] 3.20

[Murray Cumming <murrayc src gnome org>]

commit 8f5fdd764eafddf0fe9b529ad59812d44557fce6
Author: Murray Cumming <murrayc murrayc com>
Date:   Mon Mar 28 12:50:28 2016 +0200

    3.20

 NEWS         |   20 ++++++++++++++++++++
 configure.ac |    6 +++---
 2 files changed, 23 insertions(+), 3 deletions(-)
---
diff --git a/NEWS b/NEWS
index 96e21bb..e56cdb4 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,23 @@
+3.20.0:
+
+* Builder chapter and example: Describe additional parameters to get_widget_derived()
+  (Kjell Ahlstedt) Bug #134161
+* CellrendererPopup example: Don't use deprecated methods.
+  (Kjell Ahlstedt)
+* Custom widget and ListBox examples: Update use of CSS files.
+  (Kjell Ahlstedt)
+* Custom widget example: Avoid some warnings.
+  (Kjell Ahlstedt)
+* ProgressBar example: Fix the type of a signal connection id data member.
+  (Kjell Ahlstedt)
+* Update the Internationalization chapter.
+  (Kjell Ahlstedt) Bug #701908.
+* gmmproc section: Add "String Parameter Processing" section.
+  (Kjell Ahlstedt)
+* C++11: Use nullptr instead of 0
+  (Kjell Ahlstedt)
+
+
 3.19.3:
 
 * Require the latest gtkmm and glibmm.
diff --git a/configure.ac b/configure.ac
index a0b42fa..a51df99 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,7 +1,7 @@
 ## This file is part of gtkmm-documentation.
 
 AC_PREREQ([2.59])
-AC_INIT([gtkmm-documentation], [3.19.3],
+AC_INIT([gtkmm-documentation], [3.20.0],
         [http://bugzilla.gnome.org/enter_bug.cgi?product=gtkmm],
         [gtkmm-documentation], [http://www.gtkmm.org/])
 
@@ -23,8 +23,8 @@ MM_AX_CXX_COMPILE_STDCXX_11([noext],[mandatory])
 AC_PATH_PROG([PERL], [perl], [perl])
 AC_PROG_SED
 
-PKG_CHECK_MODULES([GIOMM], [giomm-2.4 >= 2.47.3.1])
-PKG_CHECK_MODULES([GTKMM], [gtkmm-3.0 >= 3.19.3])
+PKG_CHECK_MODULES([GIOMM], [giomm-2.4 >= 2.48.0])
+PKG_CHECK_MODULES([GTKMM], [gtkmm-3.0 >= 3.20.0])
 MM_PKG_CONFIG_SUBST([GTHREAD_CFLAGS], [--cflags-only-other gthread-2.0])
 
 # glib-compile-resources and C compiler are needed to generate and compile