[polari] Bump version to 3.21.4

[Florian Müllner <fmuellner src gnome org>]

commit 1cbaff7e23be34a86f8dfa9937135dd70b86a47d
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Jul 19 19:03:02 2016 +0200

    Bump version to 3.21.4
    
    Update NEWS.

 NEWS         |   14 ++++++++++++++
 configure.ac |    2 +-
 2 files changed, 15 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 4a4649d..375b3e2 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,17 @@
+3.21.4 - "With a Little Dignity"
+================================
+* Improve text styling in chat log [Florian; #768381]
+* Fix auto-scrolling to bottom [Florian; #765129]
+* Restore highlights in messages loaded from logs [Florian; #768613]
+* Fix rooms in sidebar not updating their read/unread style [Florian; #768909]
+* Improve handling of initial pending messages [Florian; #768907]
+
+Contributors:
+  Lapo Calamandrei, Florian Müllner
+
+Translations:
+  Daniel Mustieles [es], Fabio Tomat [fur]
+
 3.21.3 - "Ben Dover"
 ====================
 * Add shortcuts to jump to top/bottom of the chat log [Danny; #755549]
diff --git a/configure.ac b/configure.ac
index 75ad3ab..6996b4c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([polari],[3.21.3],[https://bugzilla.gnome.org/enter_bug.cgi?product=polari],[polari])
+AC_INIT([polari],[3.21.4],[https://bugzilla.gnome.org/enter_bug.cgi?product=polari],[polari])
 AX_IS_RELEASE([git-directory])
 
 AC_SUBST([APP_ID],[org.gnome.Polari])