Checking in changes prior to tagging of version 0.22.

Changelog diff is:

diff --git a/Changes b/Changes
index 91a1e93..e8a48f9 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,13 @@ Revision history for Perl module Ukigumo::Client

 {{$NEXT}}

+0.22 2014-03-13T10:45:34Z
+
+    - Support compare_url (for GitHub webhooks)
+      (moznion)
+    - Support GitHub Statuses API
+      (moznion)
+
 0.21 2014-03-05T00:15:47Z

     - Throws exception if .ukigumo.yml is borken.