Checking in changes prior to tagging of version 0.20.

Changelog diff is:

diff --git a/Changes b/Changes
index bc64f63..f4c9b2b 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,9 @@ Revision history for Perl extension Teng

 {{$NEXT}}

+0.20 2013-08-21T07:39:25Z
+        - Re-release for override UNAUTHORIZED flag (same as 0.19)
+
 0.19 2013-07-26T07:23:44Z
         - ADD: Implemented set and get methods which always inflate/deflate values to Teng::Row.
         - ADD: Implemented is_changed method to Teng::Row, which is useful for determining to update actually (thanks kazeburo).