[gnome-shell-extensions] Bump version to 3.17.91

[Florian Müllner <fmuellner src gnome org>]

commit f7fd16089656c841da11a2a62451950ba7699d89
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Sep 3 16:01:29 2015 +0200

    Bump version to 3.17.91
    
    To go along GNOME Shell 3.17.91.

 NEWS         |    4 ++++
 configure.ac |    2 +-
 2 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index d084abb..1adf179 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+3.17.91
+=======
+* updated translations (nl, pl, zh_TW)
+
 3.17.90
 =======
 * window-list: Improve application ordering
diff --git a/configure.ac b/configure.ac
index b91412a..72405ff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_PREREQ(2.63)
-AC_INIT([gnome-shell-extensions],[3.17.90],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell&component=extensions])
+AC_INIT([gnome-shell-extensions],[3.17.91],[https://bugzilla.gnome.org/enter_bug.cgi?product=gnome-shell&component=extensions])
 
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_AUX_DIR([config])