fix: wrong classname used in html

views/index.html

@@ -31,8 +31,8 @@
   <h3>Usage</h3>
   <p>
     Just replace <code class="index-gh">github.com</code> with
-    <code class="index-gh">{{.host}}</code> or <code class="indexGitHub">gist.github.com</code>
-    with <code class="indexGitHub">{{.host}}/gist</code>!
+    <code class="index-gh">{{.host}}</code> or <code class="index-gh">gist.github.com</code>
+    with <code class="index-gh">{{.host}}/gist</code>!
   </p>
   <h3>DMCA/Copyright Notice</h3>
   <p>