src/Doc/prepare_document

--- a/src/Doc/prepare_document	Tue Sep 10 11:46:51 2013 +0200
+++ b/src/Doc/prepare_document	Tue Sep 10 11:57:53 2013 +0200
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
 set -e