Checking in changes prior to tagging of version 0.31.

Changelog diff is:

diff --git a/Changes b/Changes
index b933803..9c1d1cb 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,12 @@ Revision history for Perl module Ukigumo::Client

 {{$NEXT}}

+0.31 2014-05-01T04:21:43Z
+
+    - Fix the problem that doesn't show git log when both of revisions are equal
+    - Fix the handling for timeout
+    - Fix typo in the documentation
+
 0.30 2014-04-08T06:50:37Z

     - Fix bug at GitHub Notifier