Unsubscribe example

[eriktrautman]

Minor, but it'd be useful to see an example in the readme of unsubscribing a single user with the gem. I couldn't find that listed anywhere but dug into the mailchimp API and took a flier and it worked. Let the people know it can be done! :)

(this is from within the User.rb model in a before_destroy callback, hence the "self")

def unsubscribe
mailchimp = Gibbon::API.new
result = mailchimp.lists.unsubscribe({
:id => ENV["MAILCHIMP_LIST_ID"],
:email => {:email => self.email},
:delete_member => true, # this is NOT the default value
:send_notify => true,
:send_goodbye => true
})
Rails.logger.info("Unsubscribed #{self.email} from MailChimp") if result
end

[amro]

Would you mind sending a PR with a simple example added to the readme? If not I'll do it when I can. Thanks!

[eriktrautman]

PR sent