title: swift Publish plug in issue
body: <p>I was trying to make my website with Publish for swift made by Sundell.
  It secesfully built and I made my new theme.
  Now I want to add Splash plug in for code Highlight and utterance for comments.</p>
  <p>on the Sundell's github I found <a href="https://github.com/johnsundell/splashpublishplugin" rel="nofollow noreferrer">https://github.com/johnsundell/splashpublishplugin</a> How to install Splash. and I followed it but It didn't work. In my console show me Splash is install, but my code block is still not changed.</p>
  <p>I add this code block main.swift file.</p>
  <pre class="lang-swift prettyprint-override"><code>import SplashPublishPlugin
  ...
  try DeliciousRecipes().publish(using: [
      .installPlugin(.splash(withClassPrefix: &quot;classPrefix&quot;))
      ...
  ])
  </code></pre>
  <p>the problem is I already have</p>
  <pre class="lang-swift prettyprint-override"><code>try MyWebsite().publish(withTheme: .myTheme)
  </code></pre>
  <p>this line in the bottom. I tried to combine it but they give me error.</p>
  <p>what do I more to make my code block pretty?</p>
  <p>only I can see How to add disqus comment, but I want to use utterance. How can I do that?</p>