added full path togit-bakup in crontab

install

 
 if [ ! -f /etc/cron.d/git-backup ]
 then
-  echo "00 2    * * *   root    git-backup > /dev/null" > /etc/cron.d/git-backup &&
+  echo "00 2    * * *   root    /usr/local/bin/git-backup > /dev/null" > /etc/cron.d/git-backup &&
   service cron reload
 fi &&