fix readme

README.md

@@ -30,6 +30,8 @@ Example Playbook
 
 Including an example of how to use your role (for instance, with variables passed in as parameters) is always nice for users too:
 
+```yaml
+
 - hosts: localhost
   vars:
       dns_records:
@@ -41,6 +43,7 @@ Including an example of how to use your role (for instance, with variables passe
            record__type: CNAME
       roles:
          - { role: tco.dns, dns_records: {{ dns_records }}" }
+```
 
 License
 -------