[metacity/gnome-3-18] bump version to 3.18.6, update NEWS

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 4ecdc07118503cea4d443b9f4c688aacb8506c43
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Tue Jul 12 23:33:02 2016 +0300

    bump version to 3.18.6, update NEWS

 NEWS         |    6 ++++++
 configure.ac |    2 +-
 2 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index f13dbb1..3d6d8f5 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,9 @@
+Version 3.18.6
+==============
+- Fix window resizing using titlebar (Alberts Muktupāvels; LP:#1596574)
+- Small HiDPI support improvements (Alberts Muktupāvels, Giovanni Campagna)
+- Fix crash when removing secondary monitor (Alberts Muktupāvels; #766156)
+
 Version 3.18.5
 ==============
 - Fix _NET_WM_ICON in Alt-Tab switcher (Jasper St. Pierre, Owen W. Taylor;
diff --git a/configure.ac b/configure.ac
index 9944dea..88b4d97 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4,7 +4,7 @@ dnl **************************************************************************
 
 m4_define([m_major_version], [3])
 m4_define([m_minor_version], [18])
-m4_define([m_micro_version], [5])
+m4_define([m_micro_version], [6])
 m4_define([m_version], [m_major_version.m_minor_version.m_micro_version])
 
 dnl **************************************************************************