[gnome-shell/gnome-3-18] Bump version to 3.18.4

[Florian Müllner <fmuellner src gnome org>]

commit 4651b7adccdac701cf229f334f99010062509742
Author: Florian Müllner <fmuellner gnome org>
Date:   Mon Feb 22 16:44:58 2016 +0100

    Bump version to 3.18.4
    
    Update NEWS.

 NEWS         |   13 +++++++++++++
 configure.ac |    2 +-
 2 files changed, 14 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index e98fbfe..bf2c76a 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,16 @@
+3.18.4
+======
+* Fix thumbnail scaling in window switcher on HiDPI [Florian; #758676]
+* loginDialog: Update user list on user changes [Michael; #758568]
+* gdm: Do not allow bypassing disabled Sign In button  [Michael; #746180]
+* Correctly identify VPN secret requests [Lubomir; #760999]
+
+Contributors:
+  Michael Catanzaro, Florian Müllner, Lubomir Rintel
+
+Translations:
+  Kristjan SCHMIDT [eo], Daniel Korostil [uk], Andika Triwidada [id]
+
 3.18.3
 ======
 * Fix browser plugin crash in Firefox [Carlos; #737932, #757940]
diff --git a/configure.ac b/configure.ac
index 221b2c8..727b97f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_PREREQ(2.63)
-AC_INIT([gnome-shell],[3.18.3],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell],[gnome-shell])
+AC_INIT([gnome-shell],[3.18.4],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell],[gnome-shell])
 AX_IS_RELEASE([git-directory])
 
 AC_CONFIG_HEADERS([config.h])