Website: Updated URL in Autolinker example (#2751)

Author: dym-sh

plugins/autolinker/index.html

@@ -48,7 +48,7 @@ <h2>CSS</h2>
 	<h2>HTML</h2>
 	<pre><code class="language-markup">&lt;!-- Links in HTML, woo!
 Lea Verou http://lea.verou.me or, with Markdown, [Lea Verou](http://lea.verou.me) -->
-&lt;img src="http://prismjs.com/img/spectrum.png" alt="In attributes too!" />
+&lt;img src="https://prismjs.com/assets/img/spectrum.png" alt="In attributes too!" />
 &lt;p>Autolinking in raw text: http://prismjs.com&lt;/p></code></pre>
 </section>