Update copyright range in the cgit footer

web/template/cgit/footer.html

 <div id="footer">
 	<p>
-		Copyright &copy; 2004-2019 aurweb Development Team &ndash;
+		Copyright &copy; 2004-2020 aurweb Development Team &ndash;
 		<strong>AUR packages are user produced content. Any use of the provided files is at your own risk.</strong>
 	</p>
 </div>