Define resources in Makefile

Due to the sunset of RT for CPAN it is beneficial to define
an issue tracker for libraries.

Change-Id: I58774069761d57f7ef8efd68a99e84185b92b7bd
diff --git a/script/tei2korapxml b/script/tei2korapxml
index bd54462..350a72b 100755
--- a/script/tei2korapxml
+++ b/script/tei2korapxml
@@ -926,7 +926,7 @@
 
 =head1 COPYRIGHT AND LICENSE
 
-Copyright (C) 2020, L<IDS Mannheim|https://www.ids-mannheim.de/>
+Copyright (C) 2021, L<IDS Mannheim|https://www.ids-mannheim.de/>
 
 Author: Peter Harders
 
@@ -939,6 +939,6 @@
 L<Leibniz-Gemeinschaft|http://www.leibniz-gemeinschaft.de/>.
 
 This program is free software published under the
-L<BSD-2 License|https://raw.githubusercontent.com/KorAP/KorAP-XML-TEI/master/LICENSE>.
+L<BSD-2 License|https://opensource.org/licenses/BSD-2-Clause>.
 
 =cut