Checking in changes prior to tagging of version 0.19.

Changelog diff is:

diff --git a/Changes b/Changes
index 330aec6..bfc126e 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,9 @@ Revision history for Perl extension Growl::GNTP

 {{$NEXT}}

+0.19 2013-04-07T11:25:12Z
+        - depend on IO::Socket::PortState.
+
 0.18 2013-03-27T17:43:17Z
         - minilize