acmebot: update to v2.7.0

acmebot/defaults/main.yml

 ---
 
 acmebot_account_mail: "{{ adminaddr }}"
-acmebot_version: "v2.6.0"
+acmebot_version: "v2.7.0"
 acmebot_enable_update_check: true
 
 acmebot_settings: {}