Initial state doesn't work in Rails 4.2

Hi, I have problem with initial state in new Rails 4.2

``` ruby
class User < ActiveRecord::Base
  state_machine initial: :waiting_confirmation do
    state :waiting_confirmation
    state :active
  end
end
```

``` ruby
Loading development environment (Rails 4.2.0)
[1] pry(main)> User.new.state
=> nil
```

Any ideas?
