Update demo copyright to 2025

Author: wimpyprogrammer

demo/index.html

@@ -163,7 +163,7 @@
 			<footer>
 				<p class="float-left">
 					&copy;
-					<a href="http://www.wimpyprogrammer.com/">WimpyProgrammer.com</a> 2019
+					<a href="http://www.wimpyprogrammer.com/">WimpyProgrammer.com</a> 2025
 				</p>
 				<p class="float-right">
 					<a href="https://github.com/wimpyprogrammer/strings-to-regex"