Format markdown and clarify that we require Chef 12.1
Format markdown and clarify that we require Chef 12.1

12.0 doesn't support compat_resource

Signed-off-by: Tim Smith <764ef62106582a09ed09dfa0b6bff7c05fd7d1e4@chef.io>

opscode-cookbooks/apparmor,chef-cookbooks/apparmor,opscode-cookbooks/apparmor