[gnome-shell/gnome-3-20] Update to 3.20.4

[Florian Müllner <fmuellner src gnome org>]

commit a7ab0892e6df8ce910b8f9d5a76e2863885f3b01
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Aug 19 22:58:29 2016 +0200

    Update to 3.20.4
    
    Update NEWS.

 NEWS         |   12 ++++++++++++
 configure.ac |    2 +-
 2 files changed, 13 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 71e6eed..f4629e2 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,15 @@
+3.20.4
+======
+* Free old backgrounds immediately [Hyungwon; #766353]
+* Adjust to flatpak PermissionStore API changes [Florian; #766598]
+* calendar: Only hide dismissed occurrence of recurring event [Florian; #748226]
+
+Contributors:
+  Hyungwon Hwang, Florian Müllner
+
+Translations:
+  Bruce Cowan [en_GB], Piotr Drąg [pl]
+
 3.20.3
 ======
 * Fix sorting of hidden apps in app switcher [Florian; #766238]
diff --git a/configure.ac b/configure.ac
index 555067b..7d6a274 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_PREREQ(2.63)
-AC_INIT([gnome-shell],[3.20.3],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell],[gnome-shell])
+AC_INIT([gnome-shell],[3.20.4],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell],[gnome-shell])
 AX_IS_RELEASE([git-directory])
 
 AC_CONFIG_HEADERS([config.h])