[sushi] release: prepare for 3.28.1

[Cosimo Cecchi <cosimoc src gnome org>]

commit d398178aecd7f87cddc547edfb5ba100b63366f2
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Thu Apr 19 08:17:17 2018 -0700

    release: prepare for 3.28.1

 NEWS         |    6 ++++++
 configure.ac |    2 +-
 2 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/NEWS b/NEWS
index 16b2d5c..5a592c5 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,9 @@
+3.28.1
+======
+
+- Fix LibreOffice to PDF conversion regression (Robert McQueen)
+- Add support for docx/pptx/xlsx MIME types (Robert McQueen)
+
 3.28.0
 ======
 
diff --git a/configure.ac b/configure.ac
index 5667565..128b150 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 dnl -*- mode: m4 -*-
 AC_PREREQ(2.63)
-AC_INIT([sushi],[3.28.0],[],[sushi])
+AC_INIT([sushi],[3.28.1],[],[sushi])
 
 AC_CONFIG_HEADERS([config/config.h])
 AC_CONFIG_SRCDIR([src/main.c])