Checking in changes prior to tagging of version 0.19.

Changelog diff is:

diff --git a/Changes b/Changes
index 1b55a2f..3677fae 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Plack::Middleware::ServerStatus::Lite

 {{$NEXT}}

+0.19 2013-08-26T05:03:32Z
+
+       - add warnings when 'allow' is missing.
+         https://github.com/kazeburo/Plack-Middleware-ServerStatus-Lite/issues/12
+
 0.18 2013-07-22T06:39:12Z

        - add more tests. check response body