Ansible version compatibility

This collection has been tested against following Ansible versions

>=2.15.0.

For collections that support Ansible 2.9, please ensure you update your network_os to use the fully qualified collection name (for example, cisco.ios.ios). Plugins and modules within a collection may be tested with only specific Ansible versions. A collection may contain metadata that identifies these versions. PEP440 is the schema used to describe the versions of Ansible.