add missing info

README.md

@@ -4,6 +4,7 @@
 * git clone https://git.virtit.fr/VirtIT/tpl-bind9 /etc/bind
 * rm -r /etc/bind/.git
 * Run ```rndc-confgen | grep '^key "rndc-key" {' -A3 > rndc.key```
+* Run ```mkdir /var/log/named && chown bind: /var/log/named```
 * Restart bind service
 
 ## How to use :