From: Ana Guerrero Lopez <ana@debian.org>
Date: 2016-09-04

The script contains several bashims, change the shebang to use bash.

--- a/doc/generate
+++ b/doc/generate
@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 docdir=`dirname $0`
 mode=$1
