use Text::Diff for better diag
Refactor the messages
use Devel::CodeObserver
Checking in changes prior to tagging of version 0.22.

Changelog diff is:

diff --git a/Changes b/Changes
index 4a80034..efe0376 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension Test-Kantan

 {{$NEXT}}

+0.22 2014-03-10T01:18:39Z
+
+    - use Devel::CodeObserver
+
 0.21 2014-03-09T13:41:43Z

     - Change message group title display format in Reporter::Spec.