use SPDX license identifier

.SRCINFO

@@ -1,10 +1,10 @@
 pkgbase = perl-exporter-lite
 	pkgdesc = lightweight exporting of functions and variables
 	pkgver = 0.09
-	pkgrel = 3
+	pkgrel = 4
 	url = https://metacpan.org/release/Exporter-Lite
 	arch = any
-	license = Artistic-1.0-Perl
+	license = Artistic-2.0
 	depends = perl
 	options = !emptydirs
 	source = https://cpan.metacpan.org/authors/id/N/NE/NEILB/Exporter-Lite-0.09.tar.gz