[metacity] bump version to 3.28.0, update NEWS

[Alberts Muktupāvels <muktupavels src gnome org>]

commit c0d4b2fc0fcd6f2d3c37da935923f9e9ed5eb99f
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sun Mar 11 16:43:23 2018 +0200

    bump version to 3.28.0, update NEWS

 NEWS         |    7 +++++++
 configure.ac |    2 +-
 2 files changed, 8 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index c1f5bc0..6277038 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,10 @@
+Version 3.28.0
+==============
+- Fix build warnings
+- Fix missing shadow from some windows (#789251)
+- Updated translations:
+  Ask Hjorth Larsen (da), gogo (hr), Joe Hansen (da), Kristjan SCHMIDT (eo).
+
 Version 3.26.0
 ==============
 - Fix memory leak when changing theme (#788078)
diff --git a/configure.ac b/configure.ac
index 31dbcc9..5f9e7e9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@ dnl Define version info
 dnl **************************************************************************
 
 m4_define([m_major_version], [3])
-m4_define([m_minor_version], [26])
+m4_define([m_minor_version], [28])
 m4_define([m_micro_version], [0])
 m4_define([m_version], [m_major_version.m_minor_version.m_micro_version])