METRON-1886 Update to minimum Ansible version in documentation

[aurelienduarte]

ansible/awx#532

include_tasks support

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[Please place any comments here. A description of the problem/enhancement, how to reproduce the issue, your testing methodology, etc.]

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[JonZeolla]

From what I can tell, include_tasks was added in 2.4.0 and the patch versions only include bugfixes. Can you point me to an error message that you're seeing, or a change in ansible that we need to make sure is included?

[mmiklavc]

@aurelienduarte - any updates on this PR?