[gnome-panel] bump version to 3.18.1, update NEWS

[Alberts Muktupāvels <muktupavels src gnome org>]

commit bca0a6e8d297aec5a2dadebffb713d2816ee004d
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Oct 13 03:41:42 2015 +0300

    bump version to 3.18.1, update NEWS

 NEWS         |    7 +++++++
 configure.ac |    2 +-
 2 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index ded029d..0def332 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,10 @@
+Version 3.18.1
+==============
+- Fully ported away from gnome-common.
+- Fixed bug - 3px black line at the bottom of the screen.
+- Fixed bug - panel background image is not resized immediately on panel
+  orientation or size change.
+
 Version 3.18.0
 ==============
 - Added missing icons in menus. (Balló György)
diff --git a/configure.ac b/configure.ac
index f5fa006..73b0778 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,7 +4,7 @@ dnl **************************************************************************
 
 m4_define([gp_major_version], [3])
 m4_define([gp_minor_version], [18])
-m4_define([gp_micro_version], [0])
+m4_define([gp_micro_version], [1])
 m4_define([gp_version], [gp_major_version.gp_minor_version.gp_micro_version])
 
 dnl **************************************************************************