[polari] Bump version to 3.21.3

[Florian Müllner <fmuellner src gnome org>]

commit 5e317951cafdde2e84c019f111635c9c60f373cc
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Jun 21 22:12:37 2016 +0200

    Bump version to 3.21.3
    
    Update NEWS.

 NEWS         |   12 ++++++++++++
 configure.ac |    2 +-
 2 files changed, 13 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 9f5ca64..4a4649d 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,15 @@
+3.21.3 - "Ben Dover"
+====================
+* Add shortcuts to jump to top/bottom of the chat log [Danny; #755549]
+* Track users to fix wrong online status in chat log [Rares; #763868]
+
+Contributors:
+  Anders Jonsson, Christian Kirbach, Danny Mølgaard, Florian Müllner,
+  Rares Visalom
+
+Translations:
+  Daniel Mustieles [es], Tiago Santos [pt], Andika Triwidada [id]
+
 3.21.2 - "Still Dead"
 =====================
 * Support /close command [Florian; #763385]
diff --git a/configure.ac b/configure.ac
index 98454ec..75ad3ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-AC_INIT([polari],[3.21.2],[https://bugzilla.gnome.org/enter_bug.cgi?product=polari],[polari])
+AC_INIT([polari],[3.21.3],[https://bugzilla.gnome.org/enter_bug.cgi?product=polari],[polari])
 AX_IS_RELEASE([git-directory])
 
 AC_SUBST([APP_ID],[org.gnome.Polari])