Update README
Update README

- Word wrap for viewing on smaller terminals
- Use consistent style for unordered list (`-` over `*`)
- Use preferred named links
- Update stale hyperlinks to latest redirects (most are now HTTPS!)
- Add note about Ansible version requirements (Ansible 2.2 is not
  supported, Ansible 2.4 will work but is EOL)

YPCrumble/ansible-django-stack,jcalazan/ansible-django-stack,jcalazan/ansible-django-stack,jcalazan/ansible-django-stack,YPCrumble/ansible-django-stack,YPCrumble/ansible-django-stack