Yes it is, updated! :-)

~~~ruby
>> require 'octokit'
=> true
>> client = Octokit::Client.new(netrc: true)
=> #<Octokit::Client:0x0000000393c0d0 ...>
>> issues = client.issues('rails/rails', state: :open, sort: :updated);
>> issues[0].milestone
=> nil
~~~