update docs
Checking in changes prior to tagging of version 0.02.

Changelog diff is:

diff --git a/Changes b/Changes
index 71d2817..84e279f 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension Time-Crontab

 {{$NEXT}}

+0.02 2014-01-06T07:19:22Z
+
+    - add document about Algorithm::Cron
+
 0.01 2013-12-27T04:10:21Z

     - original version