Checking in changes prior to tagging of version 0.22.

Changelog diff is:

diff --git a/Changes b/Changes
index a3c7c71..ad897c0 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension Monoceros

 {{$NEXT}}

+0.22 2013-08-29T02:50:57Z
+
+  - improved around readahead
+
 0.21 2013-08-28T05:21:59Z

   - use AnyEvent::Util::portable_socketpair