Use current year for README.md copyright

Author: Planeshifter

lib/node_modules/@stdlib/_tools/scripts/publish_packages.js

@@ -69,6 +69,8 @@ var topics = setTopics.factory( {
 	'token': ENV.GITHUB_TOKEN
 }, onTopics );
 
+var currentYear = new Date().getFullYear();
+
 var INSTALLATION_SECTION = [
 	'<section class="installation">',
 	'',
@@ -238,7 +240,7 @@ function mainRepoSection( customLicense ) {
 		'',
 		'## Copyright',
 		'',
-		'Copyright &copy; 2016-2021. The Stdlib [Authors][stdlib-authors].',
+		'Copyright &copy; 2016-'+currentYear+'. The Stdlib [Authors][stdlib-authors].',
 		'',
 		'</section>',
 		'',