add benchmark
Checking in changes prior to tagging of version 0.20.

Changelog diff is:

diff --git a/Changes b/Changes
index cdf5a65..0ca8662 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for Perl extension Plack::Middleware::AxsLog

 {{$NEXT}}

+0.20 2014-01-29T03:02:52Z
+
+        - use POSIX::strftime::Compiler 0.30
+
 0.13 2013-10-27T14:15:09Z

         - add format_options (Thank you zentooo)