ansible_role_versioncheck/tasks/main.yml

---
- name: "check if ansible version is above {{ check_ansible_version }}"
  assert:
    that: "ansible_version.full is version_compare(check_ansible_version, '>=')"
    msg: >
      "You must update Ansible to at least 2.8 to use this version of the toolbox openstack playbook."      
  delegate_to: localhost