Add missing vk to demo examples

demo/index.html

@@ -74,13 +74,13 @@ <h1>Lorem ipsum dolor sit amet, consectetuer adipiscing elit</h1>
         <dt>data-mail-url:</dt><dd>mailto:[email protected]</dd>
         <dt>data-title:</dt><dd>Lorem ipsum</dd>
         <dt>data-url:</dt><dd>http://www.heise.de/ct/</dd>
-        <dt>data-services:</dt><dd>[&amp;quot;whatsapp&amp;quot;,&amp;quot;facebooklike&amp;quot;,&amp;quot;facebook&amp;quot;,&amp;quot;twitter&amp;quot;,&amp;quot;googleplus&amp;quot;,&amp;quot;mail&amp;quot;,&amp;quot;info&amp;quot;]</dd>
+        <dt>data-services:</dt><dd>[&amp;quot;whatsapp&amp;quot;,&amp;quot;facebooklike&amp;quot;,&amp;quot;facebook&amp;quot;,&amp;quot;twitter&amp;quot;,&amp;quot;googleplus&amp;quot;,&amp;quot;vk&amp;quot;,&amp;quot;mail&amp;quot;,&amp;quot;info&amp;quot;]</dd>
         <dt>data-facebook-count-btn:</dt><dd>both</dd>
     </dl>
     <article class="slim">
         <header>
             <h1>Lorem ipsum dolor sit amet, consectetuer adipiscing elit</h1>
-            <div data-backend-url="/backend.json" class="shariff" data-services="[&quot;whatsapp&quot;,&quot;facebooklike&quot;,&quot;facebook&quot;,&quot;twitter&quot;,&quot;googleplus&quot;,&quot;mail&quot;,&quot;info&quot;]" data-mail-url="mailto:[email protected]" data-lang="en" data-title="Lorem ipsum" data-facebook-count-btn="both"></div>
+            <div data-backend-url="/backend.json" class="shariff" data-services="[&quot;whatsapp&quot;,&quot;facebooklike&quot;,&quot;facebook&quot;,&quot;twitter&quot;,&quot;googleplus&quot;,&quot;vk&quot;,&quot;mail&quot;,&quot;info&quot;]" data-mail-url="mailto:[email protected]" data-lang="en" data-title="Lorem ipsum" data-facebook-count-btn="both"></div>
             <time datetime="2014-11-13T10:45:00+02:00">13.11.2014 - 12:45 Uhr</time>
         </header>
         <p class="deck">A small river named Duden flows by their place and supplies it with the necessary regelialia. It is a paradisematic country, in which roasted parts of sentences fly into your mouth.</p>