Using postgresql_version variable in task's name

postgresql/tasks/systemd.yml

@@ -14,7 +14,7 @@
     line: 'Environment=PGDATA={{path_to_icat}}'
   when: (ansible_facts['distribution'] == "CentOS" and ansible_facts['distribution_major_version'] == "8")
 
-- name: Start postgresql-9.6 service on CentOS 7
+- name: Start postgresql-{{ postgresql_version }} service on CentOS 7
   systemd: 
     name: postgresql-{{ postgresql_version }}
     state: started