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/Changes b/Changes
index d3252c4..f61104b 100644
--- a/Changes
+++ b/Changes
@@ -1,7 +1,8 @@
         - -s option added that uses sentence boundaries provided by the KorAP tokenizer (-tk)
         - tokenizer invocation comments removed from KorAP XML output
         - indentation of </span> tags fixed
-        - character entities that used in DeReKo are automatically replaced by their corresponding characters
+        - character entities used in DeReKo are automatically replaced by their corresponding characters
+        - resources defined in Makefile
 0.03 2021-01-12
         - Update KorAP-Tokenizer to released 2.0 version
         - Improve test suite for recent version