Checking in changes prior to tagging of version 0.40.

Changelog diff is:

diff --git a/Changes b/Changes
index 3757b06..2664852 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,8 @@
 Revision history for Perl extension Finance::TW::TAIFEX

+0.40 Fri Feb 22 23:18:57 CST 2013
+        - Add 2013-02-23 to calendar.
+
 0.39 Sun Dec 30 15:53:15 CST 2012
         - 2013 calendar.