[libgtop] Prepare release 2.31.91

[Robert Roth <robertroth src gnome org>]

commit 9764518807fb6f98a93a5425299d15bc03ab16ed
Author: Robert Roth <robert roth off gmail com>
Date:   Mon Sep 14 19:56:24 2015 +0300

    Prepare release 2.31.91

 NEWS |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 78e3611..4e5c0bd 100644
--- a/NEWS
+++ b/NEWS
@@ -1,8 +1,13 @@
-18 August 2015: Overview of changes in 2.31.90.1
+14 September 2015: Overview of changes in 2.31.91
 ================================================
 * Darwin:
   - Fixed build.
 
+* All
+  - GI docs fixes
+  - include fixes
+  - Updated translations
+
 16 August 2015: Overview of changes in 2.31.90
 =============================================
 * ABI changes: