Define resources in Makefile

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

Change-Id: I1ab899a984121b85213d2a45a98a7a94f5122925
diff --git a/Changes b/Changes
index 7971f0b..c95b9f0 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,7 @@
         - Replaced Log4perl with Log::Any.
         - Ignore level < 0 structures in DeReKo, but support
           them for base annotations.
+        - Define resources in Makefile.
 
 0.41 2020-08-10
         - Added support for RWK annotations.