To update it you can use the command :
sed -i 's/grant-host = localhost/grant-host = \%/' /etc/wo/wo.conf
Make sure you have comment the line
bind 127.0.0.1 in the remote MySQL server configuration in
/etc/mysql/my.cnf and you have grant all permissions to a remote root user :
mysql -e "GRANT ALL PRIVILEGES on *.* to 'root'@'%' IDENTIFIED BY 'MYSQL_ROOT_PASS' WITH GRANT OPTION;"
I will publish a guide in the documentation asap