Update copyright year

Author: WhyNotHugo

layouts/_default/baseof.html

@@ -35,7 +35,7 @@ <h1>pimutils</h1>
     {{ block "main" . }} Content for each page will end up here. {{ end }}
 
     <footer>
-      Copyright &copy; 2017-2024
+      Copyright &copy; 2017–2024
       <a href="/contact/">the pimutils members</a>.
     </footer>
   </body>