Updated copyright year to 2016

Author: jackycute

public/index.ejs

@@ -151,7 +151,7 @@
                         <h6>
                             <iframe src="//ghbtns.com/github-btn.html?user=hackmdio&repo=hackmd&type=star&count=true" frameborder="0" scrolling="0" width="90px" height="20px" style="vertical-align:middle;"></iframe>
                         </h6>
-                        <p>&copy; 2015 <a href="https://www.facebook.com/TakeHackMD" target="_blank"><i class="fa fa-facebook-square"></i> HackMD</a> by <a href="https://github.com/jackycute" target="_blank"><i class="fa fa-github-square"></i> jackycute</a>
+                        <p>&copy; 2016 <a href="https://www.facebook.com/TakeHackMD" target="_blank"><i class="fa fa-facebook-square"></i> HackMD</a> by <a href="https://github.com/jackycute" target="_blank"><i class="fa fa-github-square"></i> jackycute</a>
                         </p>
                     </div>
                 </div>