No need to monkey patch

[biomancer]

Hi! I've noticed that you use monkey patching, but actually Kramdown supports custom converters, so you can do just extend it from Html:

module Kramdown
  module Converter
    class Amp < Html
       # override what you need here
    end
  end
end

And then just use like that:
Kramdown::Document.new(YOUR_TEXT).to_amp