Add a script to make the version bump

scripts/version-bump

+#!/bin/sh
+
+set -e
+
+if [ $# -ne 2 ]; then
+  echo "USAGE: $0 VERSION CODENAME" >&2
+  exit 1
+fi
+
+VER=$1
+FULLVER=$VER
+CODENAME=$2
+
+[ "$(echo "$FULLVER" | grep -o -F . | wc -c)" -lt 3 ] && FULLVER="$FULLVER.0"
+
+# update the files
+sed -e 's/^\(.. |(version)| replace:: \).*$/\1'"$VER"'/' -i doc/geany.txt
+sed -e 's/^\([ 	]*version="\)[^"]*\("\)/\1'"$FULLVER"'.0\2/' -i geany.exe.manifest
+
+sed -e '
+s/^\(#define VER_FILEVERSION      *\)[^ ].*$/\1'"$(echo "$FULLVER" | tr . ,)"',0/
+s/^\(#define VER_FILEVERSION_STR  *\)[^ ].*$/\1"'"$VER"'"/
+' -i geany_private.rc
+
+sed -e 's/^\(AC_INIT([^,]*, *\[\)[^]]*\(\],\)/\1'"$VER"'\2/' -i configure.ac
+sed -e 's/^\(#define GEANY_CODENAME[	]*"\)[^"]*\("\)/\1'"$CODENAME"'\2/' -i src/geany.h
+
+sed -e '
+1i Geany '"$VER"' (unreleased)\n\n
+' -i NEWS
+
+# show commit message to use
+cat <<EOF
+Message for the commit, after you have checked the changes:
+-----------------------------------------------------------
+
+Post release version bump
+
+Say hello to Geany $VER "$CODENAME"!
+EOF