Checking in changes prior to tagging of version 0.18.

Changelog diff is:

diff --git a/Changes b/Changes
index 13dbf69..2be5aea 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,11 @@ Revision history for Perl extension Monoceros

 {{$NEXT}}

+0.18 2013-06-11T06:12:22Z
+
+  - support min-readahead-reqs option
+  - requires Test::TCP >= 2.00
+
 0.17 2013-06-07T01:50:12Z

   - support max-readahead-reqs option