Checking in changes prior to tagging of version 0.21.

Changelog diff is:

diff --git a/Changes b/Changes
index 62eb372..f9f376a 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,7 @@
 Revision history for WebService-Simple

+0.21  2013/08/20
+       - Update tests for using XML::Parser::Lite::Tree
 0.20  2013/08/20
        - Support Perl 5.18.*
        - Fixed for Hash randomization.