Bump copyright year

layouts/partials/footer.html

@@ -51,7 +51,7 @@
           Toha
         </a>
       </div>
-      <div class="col-md-4">© 2019 Copyright.</div>
+      <div class="col-md-4">© 2020 Copyright.</div>
       <div class="col-md-4">
         Powered by <a href="https://gohugo.io/">Hugo
         <img