use Module::Spy 0.03
Checking in changes prior to tagging of version 0.19.

Changelog diff is:

diff --git a/Changes b/Changes
index 175001b..a765069 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Test-Kantan

 {{$NEXT}}

+0.19 2014-03-07T03:56:19Z
+
+    - use Module::Spy 0.03 interface.
+      It makes spy() renamed to spy_on()
+
 0.18 2014-03-07T00:53:28Z

     - Show message if tests failed in the suites