[zenity] Bump to 3.18.0

[Arx Henrique Pereira da Cruz <arxcruz src gnome org>]

commit f71eafd2c9370be8be6497fb14491bda6e9e9b14
Author: Arx Cruz <arxcruz gnome org>
Date:   Mon Sep 21 14:44:11 2015 +0200

    Bump to 3.18.0

 NEWS |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/NEWS b/NEWS
index 25c2330..444f3ba 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+Zenity 3.18.0
+       - Fix Makefile files
+       - Translation updates
+
 Zenity 3.16.3
         - Fix zenity --list (Arx Cruz)
         - Bug #751332 - zenity --forms does not center in the screen (Arx Cruz)