Update index.html

Author: previ

index.html

@@ -22,6 +22,7 @@
         <h1>CoderBot</h1>
         <h2>RaspberryPI-based bot controller</h2>
         <a href="https://github.com/previ/coderbot" class="button"><small>View project on</small>GitHub</a>
+        <a href="https://plus.google.com/100258377718556176811" rel="publisher">Google+</a>
       </div>
     </header>