Checking in changes prior to tagging of version 0.19.

Changelog diff is:

diff --git a/Changes b/Changes
index f43aaf6..d23c380 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl module Ukigumo::Client

 {{$NEXT}}

+0.19 2014-01-16T06:48:30Z
+
+    - Load Ukigumo::Client::Executor::Command expressly.
+      (tokuhirom)
+
 0.18 2013-07-25T17:35:35Z

     - fix dependencies