Restructure test suite to prepare CPAN release

Change-Id: If3033774f50d33b2e5b3344e3927fd534cef4dfb
diff --git a/Changes b/Changes
index d26c56b..e2092a3 100644
--- a/Changes
+++ b/Changes
@@ -1,8 +1,10 @@
-0.41 2020-06-16
+0.41 2020-08-03
         - Added support for RWK annotations.
         - Improved DGD support.
         - Fixed bug in RWK support that broke on
           some KorAP-XML files.
+        - Separate "real data" test suite from artificial
+          tests to prepare for CPAN release.
 
 0.40 2020-03-03
         - Fixed XIP parser.