Checking in changes prior to tagging of version 1.22.

Changelog diff is:

diff --git a/Changes b/Changes
index 390c121..228b6aa 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,9 @@ Revision history for Perl extension WebService::Dropbox

 {{$NEXT}}

+1.22 2014-10-07T09:12:06Z
+        - support　WebService::Dropbox#files's error
+
 1.21 2013-10-01T04:06:00Z
         - added HTTP::Message for the cpanfile