Feature: Also cache 06perms.txt

[sjn]

Hei!

I'm thinking that communicating changes in distro permissions or announcements may be beneficial.

For example, if $work depends on Acme::Useful::Module, and the sole author gets run over a bus, leading to the dist maintainer being set to HANDOFF, I think it would be good if this would be communicated in any tooling used by this business.

e.g. if cpm(1) or cpanm(1) or cpan(1) could give a notice if any modules that just were installed need adoption, and if the business finds this necessary, it could decide to volunteer taking over the dist.

To help make this easier, let's make the 06perms.txt file available. :-)