title: slick slider adaptive height issue
body: <p>I'm using slick slider, I have my ul &amp; li items and I have set the slider to use adaptiveHeight as my slide content will be different heights, I'm having an issue as I want one of my slides to load content when a user clicks a 'loadmore' button however when the user clicks the button the loaded content is not resizing the slide height. Is there a way of making a slide NOT use the adaptiveHeight value?</p>
  
  <p>this is what I have for my slider currently.</p>
  
  <pre><code>$(document).ready(function () {
    $('.your-class').slick({
      arrows: false,
      dots: true,
      infinite: true,
      pauseOnFocus: true,
      slidesToShow: 1,
      slidesToScroll: 1,
      adaptiveHeight: true,
      speed: 1800,
      cssEase: 'ease',
      easing: 'swing'
    });
  });
  </code></pre>