Checking in changes prior to tagging of version 1.21.

Changelog diff is:

diff --git Changes Changes
index ca455e2..d6876e2 100644
--- Changes
+++ Changes
@@ -2,6 +2,11 @@ Revision history for Perl module SQL::Maker

 {{$NEXT}}

+1.21 2014-12-22T06:27:33Z
+
+    Official support for directly passing a SQL::QueryMaker object as $where parameter #42
+    (debug-ito)
+
 1.20 2014-07-31T20:59:30Z

     - DateTime is a testing deps