[mod] #134: Get rid of update_copyright_year.sh which becomes useless

update_copyright_year.sh

-#!/bin/bash
-
-# Script to update the copyright year in header files
-
-NEW_YEAR=`date +"%Y"`
-OLD_YEAR=`expr $NEW_YEAR - 1`
-find duniterpy tests examples -type f -name "*.py" | \
-xargs sed -i "s/Copyright  2014-$OLD_YEAR V/Copyright  2014-$NEW_YEAR V/g"