[gnome-logs] Update NEWS for 3.17.91 release

[David King <davidk src gnome org>]

commit 3f1a49af495259a83c161c2d531be8bdc471bdbd
Author: David King <davidk gnome org>
Date:   Tue Sep 1 08:37:06 2015 +0100

    Update NEWS for 3.17.91 release

 NEWS         |    8 ++++++++
 configure.ac |    2 +-
 2 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index b8a7689..ba3a8dc 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,11 @@
+GNOME Logs 3.17.91
+==================
+
+* boot selection UI improvements from Jonathan Kang
+* updates to Swedish, Galician, Slovak, Polish, French, Portuguese, Spanish,
+  Chinese (Taiwan), Turkish, Russian, Greek, Indonesian and Hungarian
+  translations
+
 GNOME Logs 3.17.90
 ==================
 
diff --git a/configure.ac b/configure.ac
index 95e76d1..30611ef 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,5 +1,5 @@
 AC_INIT([Logs],
-        [3.17.90],
+        [3.17.91],
         [davidk gnome org],
         [gnome-logs],
         [https://wiki.gnome.org/Apps/Logs])