README: renew: fix cert path

The fullpath is needed, in the correct directory.

Signed-off-by: Matthieu Baerts (NGI0) <[email protected]>

README.md

@@ -54,7 +54,7 @@ docker run --name mptcp-check \
 email= #the email used by certbot
 url= #your domain name
 path=/var/docker/mptcp-check
-cert="certbot/conf/live/${url}/fullchain.pem"
+cert="${path}/cert/live/${url}/fullchain.pem"
 
 cert_before=$(sha256sum "${cert}")