fix: remove unsupported constant

components/navbar-footer.php

@@ -7,10 +7,10 @@
   <div class="collapse navbar-collapse" id="SecondNavbar">
     <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
       <li class="nav-item inactive">
-        CC BY-SA 2013-<?php print(date(Y)); ?> <strong><?php bloginfo('name'); ?></strong>
+        CC BY-SA 2013-<?php print(date('Y')); ?> <strong><?php bloginfo('name'); ?></strong>
       </li>
     </ul>
-  
+
     <ul class="navbar-nav my-2 my-lg-0">
       <li class="nav-item active">
         <a class="nav-link" href="feed:<?php bloginfo('rss2_url'); ?>"><i class="fa fa-fw fa-rss"></i></a>