Is there a "Ruby Way"™ to remove boilerplate code in initializers?

I find that i'm writing lots of initialize code that basically sets attrs to parameters... similar to this:

  class SiteClient
    attr_reader :login, :password, :domain

    def initialize(login, password, site='somedefaultsite.com')
      @login = login
      @password = password
      @domain = domain
    end
  end

Is there a more Ruby way of doing this? I feel like I'm writing that same boilerplate setup code over and over these days.

Thanks