Update year to 2017

LICENSE

 The MIT License (MIT)
 
-Copyright (c) 2016 Max Wu <jackymaxj@gmail.com> and others
+Copyright (c) 2017 Max Wu <jackymaxj@gmail.com> and others
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

public/views/index.ejs

@@ -149,7 +149,7 @@
                             <iframe src="//ghbtns.com/github-btn.html?user=hackmdio&repo=hackmd&type=star&count=true" frameborder="0" scrolling="0" width="104px" height="20px"></iframe>
                         </h6>
                         <p>
-                            &copy; 2016 <a href="https://www.facebook.com/hackmdio" target="_blank"><i class="fa fa-facebook-square"></i> HackMD</a> | <a href="<%- url %>/s/release-notes" target="_blank"><%= __('Releases') %></a>
+                            &copy; 2017 <a href="https://www.facebook.com/hackmdio" target="_blank"><i class="fa fa-facebook-square"></i> HackMD</a>
                         </p>
                         <select class="ui-locale">
                             <option value="en">English</option>