Checking in changes prior to tagging of version 0.02.

Changelog diff is:

diff --git a/Changes b/Changes
index 119812b..b6ab2d3 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Class-Enum

 {{$NEXT}}

+0.02 2013-07-10T10:26:54Z
+
+    * Modify POD, add `is_*` method.
+    * Bug fix, failed overloading string("") and numeric(0+) conversion under perl 5.16.3 or older.
+
 0.01 2013-07-07T17:36:05Z

     * Initial release.