(docs) Add homepage metadata to gemspec
(docs) Add homepage metadata to gemspec

this makes it easier to access the sources of the gem
from rubygems.org or from automated tooling

Signed-off-by: Konrad Weihmann <237a31e24baec6fd7412e435f5dfb93997617781@outlook.com>

puppetlabs/facter,puppetlabs/facter,puppetlabs/facter