de acordo com a documentação, o recurso de renovação automática foi introduzido na versão 0.4.0 e não usa a sintaxe acima. por favor consulte:
As of version 0.4.0, the letsencrypt python client supports a high-level renew subcommand that attempts to renew all of your certs using the same settings that you originally used to obtain them. You can test it out by running:
letsencrypt renew --dry-run
which will obtain test certs, and shouldn’t leave any persistent changes on your system. If you like the results, you can run:
letsencrypt renew
If you want to renew specific certificates (rather than all of them) or tweak the exact parameters used for renewal, you can use the letsencrypt certonly command to perform renewal of a single certificate with more specific control of settings. When using letsencrypt certonly, you can obtain renewal of a single certificate at a time. Specify -d flags for each and every domain covered by the domain that you wish to renew.