use only posixshell for makepdf.sh (bash not necessary)

markdown/makepdf.sh

-#!/bin/bash
+#!/bin/sh
 if [ $# -lt 1 ]; then
         echo "USAGE: ./makepdf.sh protokoll.md"
         exit 1
 fi
-pandoc $1 --template="pandoc.finf.latex" -o ${1/md}pdf
\ No newline at end of file
+pandoc $1 --template="pandoc.finf.latex" -o ${1/md}pdf