Add script for updating for upstream git

update.sh

+#!/bin/sh
+git fetch git://git.musicpd.org/master/mpd.git master:upstream
+tag=`git tag | grep ^v | sort -n | tail -n 1 | sed s/^v//`
+git merge -s ours --no-edit v$tag
+sed -i "s/^Version:.*/Version: $tag/" mpd.spec
+sed -i "s/^Release:.*/Release: alt1/" mpd.spec
+add_changelog -e "- update to $tag" mpd.spec
+gear-update-tag -ac